Fixed CommonUtils cleanPath

It throws an InvalidPathException and can be called in other code now.
Small cleanups to MasterInfo

Added some comments and cleaned up a couple things
Alphabetized methods and added note to docs
Merge pull request #176 from manugoyal/clean-path

Fixed CommonUtils cleanPath
Merge pull request #177 from manugoyal/masterinfo-comments

Small cleanups to MasterInfo
Refactored InodeFolder to store children Inodes rather than ids

This simplifies many operations
Commented InodeFolder and cleaned up MasterInfo