Started to implement the indexed db wrapper.

Currently using chrome as a test environment.
Created the tests for the validation of the 
indexedDB implementation.
Finished the first working version of indexedDB

Tested on Chrome 20.0
Added a close method to close the databases at the
end of the tests.
Successfuly got Chrome to work

Tested on versions 26 and 27 (Canary)
Merge pull request #1 from lcavadas/indexeddb

Indexeddb implemented