Fixed bad path when file is processed multiple times

[czerwingithub]

Fixed bug that caused the path of the generated javascript file to be appended multiple times with '.js', once for each time the file was processed. This resulted in the file's path going from *.js to *.js.js to *.js.js.js, etc.

A file can be processed multiple times when you are using karma in your development environment to proxy the resulting '.js' files and you edit the underlying '.html'. Currently, you have to restart karma everytime you edit an '.html' file.