Kafka Streams Scala Versions Save

This is a bugfix release. The following issues have been fixed in this release:

1. KStream-KTable inner join
2. KStreamS#merge is recursive, causing StackOverflow on initialization

Here are the most important highlights of this release:

1. Implicit Serdes: All serializers and de-serializers are now passed as implicit serdes. APIs that take instances of Serialized, Consumed, Produced or Joined work with implicit serdes in scope. Please take a look at README for details.
2. Added type-safety: Removed support for default serdes through config. This makes the library more compile time type-safe, as any missing serdes will now be flagged as a compile time error. README has the details.

The following issues have been fixed in this release:

1. Implicit Serdes
2. KTable#filter(K,V => Boolean, Materialized) is called recusively on KTableS
3. Kafka server utils not being packaged
4. java.lang.ClassCastException for reduce api call

The following issues have been fixed:

1. KGroupedStreamS recursion - Issue with SAM conversion in Scala 2.11
2. General minor improvements

The following issues have been fixed:

1. Without project/build.properties
2. Setup Travis CI yml
3. StreamsBuilderS.globalTable misses overload with Consumed[K, V] as parameter
4. There should be a way to override the StreamBuilder instance present inside the StreamBuilderS for unit testing.
5. Issue with KStreams transform returning null

This is the first release of kafka-streams-scala.