Cleaned up copy-paste in merge code
Merge pull request #150 from mairbek/code-cleanup

Cleaned up copy-paste in OperationMerge code
Change target compatibility from 1.5 to 1.6

https://github.com/Netflix/RxJava/issues/153
Merge pull request #155 from benjchristensen/issue-153

Change target compatibility from 1.5 to 1.6