renamed deriv method to fit_deriv
rename 'deriv' to 'fit_deriv' in documenation
added an entry in the changelog
Make UTC the default time scale
Update tests for UTC default
Update docs for UTC default
Update CHANGES for UTC default
Fix spacing error
Printing columns with shape (n,1,…,1). Fixes #1522
added unit examples & link to astropy.coordinates docs.
added hard returns to line wrap.
Now elegant and efficient. #1522
Minus additional space. #1522
clarified sexagesimal.

apparently, sexidecimal is too risque. http://webcache.googleusercontent.com/search?q=cache:1mNfB-oWXBwJ:www.exampleproblems.com/wiki/index.php/Hexadecimal+&cd=10&hl=en&ct=clnk&gl=us&client=firefox-a
Merge pull request #2091 from taldcroft/time-utc-default

Make UTC the default time scale
Merge pull request #2104 from luzuku/Issue-#1522

Printing columns with shape (n,1,…,1). Fixes #1522
Merge pull request #2086 from nden/rename-deriv

Rename deriv
Merge pull request #2106 from mdboom/wcs/propagate-error-message

Propagate error message correctly in wcs pipeline
Merge pull request #2105 from kelle/master

added unit examples & link to astropy.coordinates docs.
Make -t work for .rst files.