FFJ-8 introduce convenient methods to narrow down API methods per facebook object
FFJ-14 add alias methods (remove*, revoke*)
FFJ-7 ability to configure Facebook4J settings via environment variables
FFJ-11 improve FacebookException

- add version label to exception message
- add error recovery tactics judgment link url to exception message
prepare release 2.0.5
Merge branch 'release/2.0.5'