Fixed loadufs exclude

We were searching the exclude path list with the underfsAddress
prepended to the path, which isn't how they were in the list.
Fix for issue #111
Enable user input to override the web resources directory.
Merge pull request #125 from timothysc/tachyon-111

Fix for issue #111
Merge pull request #121 from manugoyal/master

Fixed loadufs exclude
sync under fs related doc, fixes et.
speedup unit tests