Grid Stuff

Show Grid Switch works, so does the two sliders (spacing and opacity):
TODO: save switch/slider states.
Grid Options View

GridOptionsView: added two buttons for controlling how grid type should
be shown (radio buttons/check boxes are unfortunately unavailable, also
too lazy to make a table). added switch and slider functionalities.

QuickStageView: functionality for modifying spacing of grid lines and
showing and hiding ruler labels (show/hide grid and opacity was already
done). Ruler currently shows pixel width/height not stage width/height

also, in SettingsView: took out stage dependencies since pointer to
_popoverCtrl exists, added label for dimensions(feet/meters) as well as
made the parser more strict. Note: NSNumber from int has max value of
2147482647
Merge pull request #11 from nang1/JNN--local-branch

Jnn  local branch