Add 'dropUntil' to RxScala
Add 'contains' to RxScala
Add 'repeat' to RxScala
Add 'doOnTerminate' to RxScala
Add 'startWith' to RxScala
Add 'publish' variants to RxScala
Replace '+' with '::'
Merge pull request #1159 from zsxwing/rxscala-improvement

Rxscala improvement