Merge pull request #262 from NiteshKant/0.x

Fixes for 0.3.16
Correcting the link to maven artifacts
Updating version
Make sure to release content buffer

When using HttpObjectAggregationConfigurator I
was getting a leak error if the response from
the server was empty:

```
Nov 02, 2014 6:01:41 PM io.netty.util.ResourceLeakDetector reportLeak
SEVERE: LEAK: ByteBuf.release() was not called before it's garbage-collected.
```

The difference seems to be the type of ByteBuf
for the content. HttpObjectAggregationConfigurator
will cause the type to be CompositeByteBuf
instead of EmptyByteBuf and when the response
is empty is isn't readable, but still needs to
be cleaned up.
Fixed a memory leak in SSEDecoder
Merge pull request #265 from brharrington/bytebuf-leak

Make sure to release content buffer
Merge pull request #266 from NiteshKant/0.x

New SSE implementation
Merge branch '0.x' of https://github.com/ReactiveX/RxNetty into 0.x
Updated CHANGES.md for 0.3.17