project restructure

indexeddb samples moved to a folder, samples for the other api's will be
added soon
readme file added to indexeddb folder
update of the project description
update of the readme file for indexeddb samples
update of the project description
libraries moved to common folder
web storage samples added
web storage samples expanded

added web worker test
file api samples added
added description to the folders
Merge pull request #1 from denimf/master

Sync latest changes from master