use assignment operator instead of creating Vec2 copy manually
#67 add spec for testing aabb-circle and circle-aabb collisions
#67 add failing test for aabb-circle collision detection
#69 add floating point helper and move almostEqual method out of Vec2
#69 fix lessThanOrAlmostEqual and moreThanOrAlmostEqual
#67 #68 detect and resolve aabb-circle
#67 #68 add collision detection and resolution for circle->aabb
#70 make use of vec2 equality operator (through snowhouse)
Merge pull request #71 from andystanton/feature/detect-circle-aabb-collisions

Feature/detect circle aabb collisions