fix (directiveCompiler): fix function call for resolution of directives under resolve
fix (directiveCompiler): fix problem in workflow for creation of directed code

Now the promise API has been enhanced to a degree to support communication between instance- and factory-promises
Also, calling `.compile()` multiple times is now handled properly.
We have now included bu$interval, the counterpart of $timeout for setInterval
doc (bu$interval): add documentation to interval wrapper