Adding flatmap rendering functionallity

[Tal-Golan]

Addressing issue 214, I added flat-map rendering functionality. This was done by creating a Patch, a child object of Surface, that deals with storing the relevant meta-data (which patch vertices correspond to which surface vertices). I worked over all of the examples and modified the relevant functions so they work with flatmaps as seamlessly as possible.

[larsoner]

Now that #270 is in, if you rebase CircleCI might render properly.