use git subtree to graft Pkg3, etc. into stdlib

stdlib/Compat/.gitignore

@@ -0,0 +1,2 @@
+*.jl.cov
+*.jl.mem

stdlib/Compat/.travis.yml

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+language: julia
+os:
+    - linux
+    - osx
+julia:
+    - 0.6
+    - nightly
+notifications:
+  email: false

stdlib/Compat/LICENSE.md

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+The Compat.jl package is licensed under the MIT "Expat" License:
+
+> Copyright (c) 2014, 2015, 2016, 2017: Stefan Karpinski and other
+> contributors.
+>
+> Permission is hereby granted, free of charge, to any person obtaining
+> a copy of this software and associated documentation files (the
+> "Software"), to deal in the Software without restriction, including
+> without limitation the rights to use, copy, modify, merge, publish,
+> distribute, sublicense, and/or sell copies of the Software, and to
+> permit persons to whom the Software is furnished to do so, subject to
+> the following conditions:
+>
+> The above copyright notice and this permission notice shall be
+> included in all copies or substantial portions of the Software.
+>
+> THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+> EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+> MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+> IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+> CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+> TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+> SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

stdlib/Compat/Project.toml

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+name = "Compat"
+uuid = "34da2185-b29b-5c13-b0c7-acf172513d20"
+
+[deps]
+Base64 = "2a0f44e3-6c83-55bd-87e4-b1978d98bd5f"
+Dates = "ade2ca70-3891-5945-98fb-dc099432e06a"
+DelimitedFiles = "8bb1440f-4735-579b-a4ab-409b98df4dab"
+Distributed = "8ba89e20-285c-5b6f-9357-94700520ee1b"
+InteractiveUtils = "b77e0a4c-d291-57a0-90e8-8db25a27a240"
+IterativeEigensolvers = "de555fa4-b82f-55e7-8b71-53f60bbc027d"
+Libdl = "8f399da3-3557-5675-b5ff-fb832c97cbdb"
+LibGit2 = "76f85450-5226-5b5a-8eaa-529ad045b433"
+LinearAlgebra = "37e2e46d-f89d-539d-b4ee-838fcccc9c8e"
+Mmap = "a63ad114-7e13-5084-954f-fe012c677804"
+Pkg = "fe1c5a76-5840-53d2-82f9-288dd83ce2ce"
+Printf = "de0858da-6303-5e67-8744-51eddeeeb8d7"
+REPL = "3fa0cd96-eef1-5676-8a61-b3b8758bbffb"
+Random = "9a3f8284-a2c9-5f02-9a11-845980a1fd5c"
+Serialization = "9e88b42a-f829-5b0c-bbe9-9e923198166b"
+SharedArrays = "1a1011a3-84de-559e-8e89-a11a2f7dc383"
+SparseArrays = "2f01184e-e22b-5df5-ae63-d93ebab69eaf"
+SuiteSparse = "4607b0f0-06f3-5cda-b6b1-a6196a1729e9"
+Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
+Unicode = "4ec0a83e-493e-50e2-b9ac-8f72acf5a8f5"

stdlib/Compat/REQUIRE

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+julia 0.6

stdlib/Compat/appveyor.yml

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+environment:
+  matrix:
+  - JULIA_URL: "https://julialang-s3.julialang.org/bin/winnt/x86/0.6/julia-0.6-latest-win32.exe"
+  - JULIA_URL: "https://julialang-s3.julialang.org/bin/winnt/x64/0.6/julia-0.6-latest-win64.exe"
+  - JULIA_URL: "https://julialangnightlies-s3.julialang.org/bin/winnt/x86/julia-latest-win32.exe"
+  - JULIA_URL: "https://julialangnightlies-s3.julialang.org/bin/winnt/x64/julia-latest-win64.exe"
+
+branches:
+  only:
+    - master
+    - /release-.*/
+
+notifications:
+  - provider: Email
+    on_build_success: false
+    on_build_failure: false
+    on_build_status_changed: false
+
+install:
+  - ps: "[System.Net.ServicePointManager]::SecurityProtocol = [System.Net.SecurityProtocolType]::Tls12"
+# if there's a newer build queued for the same PR, cancel this one
+  - ps: if ($env:APPVEYOR_PULL_REQUEST_NUMBER -and $env:APPVEYOR_BUILD_NUMBER -ne ((Invoke-RestMethod `
+        https://ci.appveyor.com/api/projects/$env:APPVEYOR_ACCOUNT_NAME/$env:APPVEYOR_PROJECT_SLUG/history?recordsNumber=50).builds | `
+        Where-Object pullRequestId -eq $env:APPVEYOR_PULL_REQUEST_NUMBER)[0].buildNumber) { `
+        throw "There are newer queued builds for this pull request, failing early." }
+# Download most recent Julia Windows binary
+  - ps: (new-object net.webclient).DownloadFile(
+        $env:JULIA_URL,
+        "C:\projects\julia-binary.exe")
+# Run installer silently, output to C:\projects\julia
+  - C:\projects\julia-binary.exe /S /D=C:\projects\julia
+
+build_script:
+# Need to convert from shallow to complete for Pkg.clone to work
+  - IF EXIST .git\shallow (git fetch --unshallow)
+  - C:\projects\julia\bin\julia -e "versioninfo();
+      Pkg.clone(pwd(), \"Compat\"); Pkg.build(\"Compat\")"
+
+test_script:
+  - C:\projects\julia\bin\julia --check-bounds=yes -e "Pkg.test(\"Compat\")"