wrap Graphics2D, make it possible to use the names Graphics and Graphics2D directly
move etherpad-lite stuff into a new package "epl"

- renamed classes to remove the EPL prefix
- renamed EPLTalker to just Pad
- cleanup of a lot of exception handling (chain exceptions rather than printing stack everywhere)
- add a very simple edit interface to Pad
- make TextState package private
etherpad-lite references
easysync docs (for reference)