Merge pull request #1 from aggsol/master

Datenbankverbindung ohne explizite Datenbank
Check if the connection is closed before closing in transact and result set
Fix: No trailing slash after the database name
Extracted transact object to own file, introduced a namespace
Fixed small memory leak if a function was called with an unknown signature
First steps toward a npm module
Exceptions added
First steps toward multiple database types
Fix: Database type selection went missing during rebase, added it again
Separated select and other queries
Updated readme and demo
Updated readme
added license
Some bugfixes for sqlite
Removed unecessary error flag in a function
Changed the order of error and result in the callback
Updated readme