Improved coffee syntax
Added: files can now be overwritten. Close #90
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Upgraded: async.js
Fixed: some tests were commented
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Fixed: when unselecting elements from 'select-all', the background color was not removed
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Moved: fixtures into fixtures folder. Improved overwrite test.
Improved: syntax and code style
Added: overwritten files now show an inline upload progress bar
Upgraded: backbone to 1.1.2
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Merge pull request #194 from jsilvestre/master

Added: files can now be overwritten