Added OperationRepeat & repeat operator
Added OperationRepeat & repeat operator
Added test
Operations Aggregate, Average and Sum with selector
Operation AsObservable
Operators Skip, SkipLast, Take with time
Removed ObserverBase
Merge pull request #694 from Netflix/docs

Change page from "Mathematical Operators" to "Mathematical and Aggregate Operators"
Merge pull request #689 from akarnokd/ObserverBaseLess

Removed ObserverBase
Merge pull request #664 from akarnokd/OperationAsObservable

Operation AsObservable
Remove ObserverBase Import

Was unused and causing build break once that class was removed.
Manual Merge github.com:akarnokd/RxJava SkipTakeTimed2

Conflicts:
	rxjava-core/src/main/java/rx/Observable.java
	rxjava-core/src/main/java/rx/operators/OperationTakeLast.java
Merge pull request #697 from benjchristensen/skip-take-time-merge

Manual Merge of Pull #667
Merge branch 'AggregatorsWithSelector' of github.com:akarnokd/RxJava into pull-657-merge
Remove newly added aggregate methods

- avoiding methods with `index`
- resultSelector overload is same as `reduce(seed, accumulator).map(resultSelector)`
Rename to ReduceTest
Merge pull request #698 from benjchristensen/pull-657-merge

Merge of Pull 657: Average and Sum
javadoc improvements:
* diagrams for skip(t), single(), take(t), skipLast(t)
* minor corrections, reformatting of javadoc comments
Merge remote-tracking branch 'origin/master' into docs
Repeat Operator

- merge and slight modification of https://github.com/Netflix/RxJava/pull/518