Added missing primaryKey in IDBCursor
Fixed cursor.update and cursor.delete on indexes
Added test for updating a cursor opened with a index.
Build with the latest changes.
(Will add some test for the primary key stuff)
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Fixes #109
Merge pull request #110 from andrewbranch/incoming-pr

Don't use GitHub as a CDN
Merge remote-tracking branch 'origin/incoming-pr'
Merge remote-tracking branch 'upstream/master'

Conflicts:
	src/IDBCursor.js