Add documentation describing Planck13 and massless neutrinos
Restore the original log level after each of these tests; this still didn't solve the issue but it seems worthwhile
Fixes the tests in question by not assuming that the default log level is INFO
Define degree, arcmin and arcsec Unicode characters in the latex preamble
Fix docstring format in astropy.modeling.polynomial.Legendre1DModel.deriv
provided indications to build the PDF documentation
Improved error message for WCS when incorrect number of arguments is passed.
Fix #1395: WCS functions should not accept arrays of the wrong shape
Add copy parameter to quantity instantiation; set it to False wherever the
value instantiated is already known to be a copy.
Also adjust __quantity_instance__ in Angle, though incomplete pending #1310
Replace repeated parameters in __quantity_instance__ with **kwargs
Ensure angles can deal with copy option
Small corrections for documention of copy option in quantity.py
Also ensure copy arguments get passed on if given to Longitude/Latitude
Add changelog entry
Correct behaviour for instantiation with (q, q.unit, copy=False); add tests
Change syntax for assigning new row values in add_row()

This fixes a problem that comes from the following numpy bug when assigning
to a row that has object-type fields:
```
>>> a = np.array([('1',)], dtype=[('x', 'O')])
>>> a[0] = a[0]
ERROR: ValueError: Setting void-array with object members using buffer. [IPython.core.interactiveshell]
```
Merge pull request #1394 from astrofrog/wcs-improved-error-arguments

Improved error message for WCS when incorrect number of arguments is passed
Replace .base tests (problematic on travis) with others
Make clear in documentation that copy=False should be used with care