7-Zip-JBinding release: 0.4

Release - 0.4 (beta, extraction only)
* Full rework of c++ code: thread safe JNI-calls, correct exception handling between threads
- Bug fixed #2441909 - Can't extract encrypted 7-Zip files

* New open/extract method for crypted archives and items (standard and simple interface)

* JUnit tests for the extraction of crypted archives and exception handling

* New examples on the home page