make representation api tests pass
resolve tests of cartesian units
fix distance/units test
Merge pull request #11 from eteq/coordinates-ape5-rep-tests

Coordinates ape5 rep tests
Added std header to test_representation
Layout of basic framework (coauthored by @adrn)
whitespace fixes
revamp of transformation graphs for APE5 scheme
work trying to get tests to go
more transform fixes
fix tests for UnitSphericalRepresentation
fix transformation test failures
typo fix
basic frame stuff now working
added support for no-distance case
test tweaks