MNT: Refactored the userpackages directory creation

- New approach makes a symlink from /VTTools/vt_config/NSLS-II
  to ~/.vistrails/userpackages/NSLS-II
- This is tested on windows, needs testing on linux and mac
- NOTE: The script blows away anything currently in
  ~/.vistrails/userpackages/NSLS-II
MNT: import updated
MNT: Moar corrections to setup.py for windows issues
ENH: symlinking of userpackages is safe on windows
MNT: Fixed NSLS-II/init.py so that it imports correctly
 DOC: Noted the original locatino of the user input function
MNT: Modified setup.py script to be less nukey

- Added test for symlink creation for three cases
  1. destination exists as file
  2. destination exists as empty directory
  3. destination exists as non-empty directory
- renamed a file that was getting run with nosetests
MNT: Actually enabled yaml_file as an input parameter
MNT: Fixed setup.py script
Merge pull request #16 from licode/tmp_data

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