Return batch sql results in single callback
Merge commit 'tx-cb-fix-1' into sqlg-test-1 [with minor fixes]
Use single JSON object for batch cb & completely remove old query cb mechanism
Use Cordova plugin callback mechanism to send batch results instead of calling Javascript cb
Move batch cb function & replace global cb map with local cb map
Merge commit 'tx-cb-fix-2' into sqlg-test-1 [with minor fixes]