Write up program committee manual.
Merge pull request #37 from stefanv/call_proceedings

Remove mention of pre-published proceedings
added announcement for diversity scholarships
fixed mailing to be what we sent this year.
Merge branch 'master' into pc_manual
adds mailing for review assignments
changed a little wording
updates the score script for this years csv format
moves, fixes decision template and script
adds script
Add call for papers
Update with suggestions from James's email
clean up cfp text
Push forward date. Reword according to James's suggestion.
Slight rewording