Fixes commit/transaction regressions introduced in 0.4.0

Merge pull request #63 from uber/ak_transaction

fix transaction/commits

Misc bug fixes

Merge pull request #57 from uber/bugfix

Fix incomplete processing for write queries

Fix commit bug

0.4.2

Bump version

0.4.1

Merge pull request #52 from uber/iterator

fix condition when the query returns 0 row

0.4.0

Removes row_handler callback in favor of an iterator.

0.3.6

windows crypt support

0.3.3

When vertica gives back data types that aren't mapped in the vertica/column.py file, execution of query fails. This prevent it by defaulting the data type to unspecified.

0.2.3

Incorporating @kennethdamica PR to accept execute parameters as a tuple or dict

0.2.2

Incorporates build changes/fixes contributed by @kevints.
No functional changes to the library.