Add GitHub ParsCit as submodule
Switch submodule to our fork of ParsCit
Initial switch to up-to-date GitHub ParsCit instead of version embedded in CiteSeer
Bump major version since breaking API changes are coming
Add text fixtures from ParsCit demodata
New multi-algorithm interface
Add specs based on ParsCit demos and related fixes

* Clean up title & author from SectLabel
* Handle plain text files correctly
Remove Citeseer version of ParsCit, and just keep SVMHeaderParse
Restore original CiteSeer code in part, since it does use a different header parse algorithm
Fix tests
Update README
No need to create whole temp directory for ParsCit
Only convert to text once when using multiple algorithms
Refactor and merge tests
Remove training data to save space
Switch rubygems to https
Ensure parscit files are included in gem
Remove unnecessary giant files from parscit and stop support for old "token" model
Stop support for sectLabel xml model
Add parscit files to built gem