INTSAMPLES-63 - Polish Tcp-Client-Server Sample

For reference see: https://jira.springsource.org/browse/INTSAMPLES-63

* Update README.md
* Code clean-up (E.g. convert spaces to tabs)
* Make sample executable via Maven
Merge pull request #78 from ghillert/INTSAMPLES-63

* ghillert-INTSAMPLES-63:
  INTSAMPLES-63 - Polish Tcp-Client-Server Sample