Implemented the 'any' operator
Add 'any' operator to Observable
Solve the conflict of 'any' method name in unit tests
Follow the correct logic of 'any' operator. See #385
Merge branch 'any' of git://github.com/zsxwing/RxJava into merge-385-any
Change 'any' to 'isEmpty'/'exists'
Merge pull request #398 from benjchristensen/merge-385-any

Merge 'any' Pull Request