typo
Compute the number of expected triangles for triangulation test cases
move tests utilities into spec/helpers.js
typo
add tests for issue #48
add assert module for invariant checks
replace expensive Math.atan2 by dot vectors computations. This improves the performances.

See discussion at https://groups.google.com/forum/#!topic/poly2tri/gDpr3lj3p0I
version 1.3.4
implement 'precision' option