removed 1.x compatibility layer (openhab#1284)

Signed-off-by: Kai Kreuzer <[email protected]>

Author: kaikreuzer

CONTRIBUTING.md

@@ -2,9 +2,8 @@
 
 Warning: Note that this is most likely not the project you are looking for.
 
-openHAB mainly consist out of the core components, extensions that are openHAB1-compatible from
-https://github.com/openhab/openhab1-addons and extensions that are openHAB2-compatible from
-https://github.com/openhab/openhab2-addons. All is then packaged into a distribution in
+openHAB mainly consist out of the core components and extensions that are from
+https://github.com/openhab/openhab-addons. All is then packaged into a distribution in
 https://github.com/openhab/openhab-distro.
 
 ## Contribution guidelines

bom/openhab-core/pom.xml

@@ -38,12 +38,6 @@
       <version>${project.version}</version>
       <scope>compile</scope>
     </dependency>
-    <dependency>
-      <groupId>org.openhab.core.bundles</groupId>
-      <artifactId>org.openhab.core.compat1x</artifactId>
-      <version>${project.version}</version>
-      <scope>compile</scope>
-    </dependency>
     <dependency>
       <groupId>org.openhab.core.bundles</groupId>
       <artifactId>org.openhab.core.karaf</artifactId>