Adds more flexibility to tag options

See IssueTest for all options e.g. must-fix or good
Adds some colors

(testing this out)
Updates tests so they pass
Trying to figure out why colors are not showing up in the pdfs
Creating new annotations fixes color not updating

Now to clean it up
Comment Color is based on tag
Cleaned up color changing code

Fixes #19
Refactor ReivewRequestServlet

Toning down the doPost method and breaking it up a bit.
Also adding a stub for adding comments to the pdf.