added general-purpose cache and deleted trash
added more version generating code
Merge pull request #2 from arsenij-solovjev/master

[NOP] Some documentation
added missing jquery-ui files
added render job algorithm (final render step is missing, see Deltas.js)
completed final render step
added class diagram
added missing diagram files
added example
removed typo
completed update event for tiles
added tile history update documentation
Update README.md
updated TODO and make files, fixed version cache
new update type: HISTORY
updated FEATURES.md
added NOTES.md (ideas for RPC protocol)
updates NOTES.md
Merge branch 'master' of https://github.com/Lotes/big-canvas
Merge remote-tracking branch 'origin/master'