degrees -> degree, hours -> hour everywhere
(fixed issues caused by astropy/1006)
refactor: simplify parse_radius related stuff.
removed all "stable" tests from .travis.yml; astroquery can never work
with stable until at least astropy 0.3
updated install instructions to reflect the reliance up astropy >0.3
updated more docs
travis needs the generic env stuff
fixed a minor numpy 1.5 incompatibility
Merge pull request #145 from keflavich/degree_refactor

degrees -> degree, hours -> hour everywhere