New strokes are hooked up to ring and vertex counts

New panel for n_rings in a segment
added *.pyc to gitigore
Reset to default ray_cast behavior to demonstrate to devs to find out if this is API problem

since new hack was only working some times.

undo code if selected ring is not in the selected path.  This should not happen, but it does
Will need to further inveistigate
Merge branch 'master' of https://github.com/CGCookie/retopology
typo
unusual selection scenario handled by undo state preservation
squash print error when loop cut fails which masks cause of failure
Color of selected path never changes

small bug when two paths are selected
fix #14
improve #27
Hooked up search factor to experimental settings.

This will allow for easy experimentation and tuning if users run into problems.
simple check to make sure normals are facing correctly when aligning

fix #22
Add TAB key to toggle Guide/Loop mode to Header message
Add 'Force New Segment' to header in Loop Mode
sanity check in case loading new blend file
Merge branch 'master' of https://github.com/CGCookie/retopology
Make Poly Strips only show in menu when Experimental is enabled.
Update labels and tooltip for experimental toggle.
improve #42

close #65
close #64