Add a __version__ attribute to javalang and
dynamically work out the version number in setup.py.

Signed-off-by: David Black <dblack@atlassian.com>
Merge pull request #4 from brakhane/master

Make tokenizer accept (nearly) all identifiers
Expand README to include examples and basic documentation.
Merge pull request #3 from dbaxa/expose_version_information

Add a __version__ attribute to javalang and