Update according to review in issue #1159
Remove 'startWith', add '+:' and ':+'
Update 'startWith' info in CompletenessTest
Merge pull request #1165 from zsxwing/review-issue1159

Update according to review in issue #1159
Merge branch 'master' into replay-multicast

Conflicts:
	language-adaptors/rxjava-scala/src/examples/scala/rx/lang/scala/examples/RxScalaDemo.scala