Implemenet a limit for Messages

- Implementet a limit of 250 chars
- Created the Executable of the Chat-Client/Server
Added Binaries

- Compiled the Beta code for Java 1.7 and 1.8
- Code is now compatible with Java 1.7
Merge pull request #8 from sandro-pedrett/dev_Michael

Dev michael
- bugfix disconnection client
Merge pull request #9 from sandro-pedrett/dev_sandro

Dev sandro