Adding requirements list
Adds .gitignore
Merge branch 'master' of github.com:PLOS-Web/xmlgroomer
Moves si titles to first bold sentence in subsequent paragraph
Adds tests for new si title behavior
Merge branch 'AI-132_si-legends'
Adds char stream groomer control
Adds char stream groomer that scrubs out PUA unicode chars
Adds test for pua scrub
Merge branch 'AI-138_pua-scrub'
Revert "Merge branch 'AI-132_si-legends'"

This reverts commit 4195a98c015f166272317386c66035f3fcbdb778, reversing
changes made to 580f84f73cea1b23b160e192e1ec52f92826f6b7.
Merge branch 'AI-138_pua-scrub'
Merge branch 'master' of github.com:PLOS-Web/xmlgroomer
fixes subject category (discipline-v2)