SVN trunk now is for upcoming v2.2 release
test case for issue #60
fixes issue#57
fixes issue#67
Fix some compiler warnings.
Improve error message for method invocation on null.
Issue 72

2.2b0 -> 2.2.0
Issue 73
ScriptEngineFactory should not advertise support for java
test case for issue#24
issue#17

* added old code (parse java source if existent and class file is not found) but with switch
* default is switched off
* switch on by 
** api call -> Interpreter.setCompatibility(true)
** system property -> -Dbsh.compatibility=true
fixes issue#69
fixes issue#66
issue #77: NullPointerException by calling getAllNames() after parsing a script without local member declaration
issue #79. Root cause exception in class initialization is converted to string, and can not be successfully retrieved by outer layers
Issue #82: unary operation (++/--) fails on float/double type.