Supporting cursor direction

ORDER BY was always ascending, ignoring the IDBCursor direction.
fallback to throwing Error if creating DOMException fails
Merge branch 'domeerror-fallback-to-error' of https://github.com/marianoguerra/IndexedDBShim into marianoguerra-domeerror-fallback-to-error

Conflicts:
	dist/IndexedDBShim.min.js
	dist/IndexedDBShim.min.map
Merge branch 'marianoguerra-domeerror-fallback-to-error'
Merge branch 'master' of https://github.com/Cordemans/IndexedDBShim into Cordemans-master

Conflicts:
	src/IDBCursor.js
Merge branch 'Cordemans-master'
New build
merged upstream