Added GifAnimation library.
Merge branch 'master' of https://github.com/processing/processing-web

# By Daniel Shiffman
# Via Daniel Shiffman
* 'master' of https://github.com/processing/processing-web:
  fixing tutorial xml
  adjusting XML to fix #348
  eclipse tutorial fix #259
  #263 typos
  color tutorial work #342
  typo #351