Refactored classes for working with Wikipedia; updated documentation.
Added string->int bidirectional map, for mapping Wikipedia article titles to docids; tweaked docs.
Tweaked link extraction code.
Refactoring Wikipedia collection classes to make more consistent with other collection processing classes.
Fixed integration tests.
Updated from mapred to mapreduce classes (i.e., new API)
Merge branch 'refactoring'
Published version-1.4.15 artifact