Cosmetic changes in the phasesfield module #2951

This patch touches almost every source and header file in the phasefield module to fix wrong indentation, whitespace around operators, after if/for, after commas, etc.
Other fixes include cleanup of switch statements (rm break after return, unreachable code after mooseError etc.) 

Can we leave this issue open for now? I'm sure I didn't catch everything. But since this touches so many files, it might be best to merge early.