Update rotation_matrix to reduce rounding error and correct sign convention on for arbitrary axis
Add explicit rotation_matrix tests
Make angle_axis more consistent and numerically stable (and test)
Add changelog entry
array -> asarray as suggested by @mdboom
Updated tests following @neothemachine's suggestions
Added option to use representation names in represent_as
Added test for represent_as
Replace class attribute frame_attr_names with descriptors
Update docs
Add unit tests of FrameAttribute descriptor
Put FrameAttribute into public coords API so it shows up in docs
Restore proper inheritance of frame attributes via __mro__
Change frame_attr_names() to get_frame_attr_names()
Add coveralls --rcfile option
Merge pull request #2619 from eteq/fix-rot-matrix

Fix quirks in rotation_matrix
added an equivalecny to convert between kelvin and eV
Fixed sample code in docstring of ConfigItem.
added tests and doc
fix cases where bool(frame._data) is False