Provide change log files as DOTCI_CHANGE_SET env variable in groovy
templates.
Merge remote-tracking branch 'origin/master' into feature/change_set_env_var

Conflicts:
	src/main/java/com/groupon/jenkins/dynamic/build/DbBackedBuild.java
	src/main/java/com/groupon/jenkins/dynamic/build/DynamicBuild.java
Merge pull request #85 from groupon/feature/change_set_env_var

Provide change log files as DOTCI_CHANGE_SET env variable in groovy templates.