Code Generator for Eclipse Code

Improved the jetemplate extension point to conform to the generator extension point

Removed the qualifier from the version number since the update site could not cope with it

Added qualifier to version

Set the verions dependencies for sahits plugin explicitly and otherwise none

Updated to version 2.0.0

Added missing JavaDoc

Don't externalize constant strings

Use casting for the correct return type

Specified the 1.5 SE as execution environment

Add an EntityResolver that handles namespace verification. The choosen implementation rilies on the fact, that the input data is well formed and must not be validated in a time costly manner.
This concludes the most pressuing issue of #5.