Fixed a few bugs that occured when trying to run node-migrate under windows.

[miklschmidt]

The main issue was the use of exec() to fetch a timestamp. We changed this to use the Date object instead. Furthermore we encountered an error with node-mysql resulting in bigints being returned as the actual value incremented by one. We changed the version column to varchar to avoid this problem and submitted and issue to the node-mysql repo. Oh and we added support for the AUTO_INCREMENT option on table creation as well :)

[clone1018]

+1