added astropy's .travis.yml verbatim.
added astropy 0.2rc1 in .travis
uses 0.2.1 astropy explicitly
make sure all keywords of from_array are passed to the __init__

from_array accepted keywords for uncertaity, mask, flags and meta
but did not pass them on the `NDData.__init__`, so that informatmation
was lost. This bug needs to be fixed to make the units tests of #16 pass.
changed astropy install to just pip install astropy
Merge pull request #25 from hamogu/from_arrays

make sure all keywords of from_array are passed to the __init__
Merge pull request #19 from keflavich/travis

Travis Tests
Copied over latest changes from affiliated package template
Ensure that optional dependencies for Sphinx are installed
Ensure that scipy is not required for importing
Merge pull request #27 from astrofrog/update-from-template

Copied over latest changes from affiliated package template
added a simple structure for the documentation
finished building the rudimentary spectrum1d documentation
finished building the extremely rudimentary reddening documentation.
added @keflavich's indentation suggestions
Merge pull request #28 from wkerzendorf/adding_docs

Adding rudimentary docs
Merge remote-tracking branch 'upstream/master'
fixed minor sphinx bug - thanks matplotlib PR 1708!
https://github.com/matplotlib/matplotlib/pull/1708/files