CLENotes v5.2

With the v5.2 release, full source of CLENotes is now available at GitHub. I also updated build and packaging to Maven. As before, releases can be downloaded from OpenNTF.

Changes of v5.2:

Version 5.2 (18.12.2015)

- Moved to Maven building and packaging. Consequence: development can be done without Eclipse IDE.
- Source code available at GitHub.
- Updated Xtend libraries to v2.9.0. 
- Removed separate config file and added it to Configuration.xtend (in the future: configuration to be refactored).