0.4.0

• Added metric support

0.3.1

• Separated library and tests.

0.3.0.0

• Changed module names
• Faster, better exp and trig functions
• Added contraction and projection operators
• Added some constants

0.2.0.0

• Refined exported functions
• Added exp and trig functions
• Made into Cabal package
• Basic inline documentation
• Got rid of unecessary internal stuff