adding tests for features to come
Refactored monos, added many features to posys

 - Created a template 'nomials' class for shared features
 - added 'eid' attribute to monomials (it's basically a hash of 'exp')
 - added algebraic simplification to both monomials and posynomials
 - added posynomial-posynomial multiplication
removed old files
Early matrix/vector support

a reimplemetation of the numpy matrix class, with:
 - slightly different printing
 - convenient element-wise functions
 - overloaded <= for constraint generation
removed matrix bits
adding utils stuff back in
Fixed small error, thanks to tests
making it work with tests
Merge branch 'nomials'
Merge branch 'matrices'

Conflicts:
	gpkit/__init__.py
	gpkit/utils.py