Added maven packaging and deployment supports.

The original amazon-kinesis-connectors github project doesn't provide an easy means to build the source code.  Further, for people who simply wants to use the library, there isn't any convenient way to pull the library into their project.  This pull request provides a maven pom.xml file that one can use to build the "main" parts of the library; it also provides scm configurations for the amazon team to deploy the library to maven repository if they decide to do so.  The only missing piece of configuration is the jar signing.

Samples are not included in the build (yet).