Experimental Rx Netty Bindings and RemoteRx Interfaces

… still work in progress …
Support Groovy in /src/examples/
Ported examples to Groovy

… using Groovy as Java++ for examples since we don't have Java 8 yet (and won't be able to use it inside RxJava since we have to stick to Java 6 for Android).
Added protocol handlers with generics to RxNetty
Remove experimental classes from rxjava-core
Remove examples (migrated to Groovy now)
RemoteObservableClient integrated with RxNetty and examples

- still experimenting, server side not done yet
Add Javadoc from Rx Design Guidelines
EchoServer and other examples using new Remote* Netty Impls
EchoClient functional
IntervalServer example functional
IntervalClientTakeN

- known bug still exists on IntervalServer that causes it to only support a single connection and then shuts down
BugFix: Server now stays alive between connections
EchoServer: Improved use of functional operators

Thanks @headinbox for feedback
Start of EventStream examples
Added a new protocol handler that produces string lines
Replaced old string codec with StringLineCodec
Added immediate checkpoint to avoid unnecessary re-scan of buffer upon buffer overflow.
EventStream Example with Slow Consumer
First working version of observable HTTP client