Update MathHelper.h

added random member
Update MathHelper.cpp

defined random function
Update Vector2.h

Changed crossMultiply and dotMultiply to 'Cross' and 'Dot' respectively
Update Vector2.cpp
Merge branch 'develop' into feature/vec2RandomTweaks
Updated Math::random to have a MINX/MAX
Added default precision to Math::random()
Added include for rand()
Merge pull request #71 from liam-middlebrook/feature/vec2RandomTweaks

Feature/vec2 random tweaks