Cleanup update of index.rst

Use axis when calculating median absolute deviation

Just a grammar issue in line 100 and a dead sentence in line 97

cast uncertainty to plain numpy array after combining.

Astropy release changes

Updating RTD links

Change lacosmic saturation level default to 65535

* 65535 is the more common saturation level on CCDs as it is the maximum unsigned 16 bit value ...

Fixed some formatting problems and included a lot of points [skip ci]

Fixes #343 by defaulting to OrderedDict in CCDData.meta.setter

Update astropy-helpers to v1.1.2

adding .fts support to image_collection.py

Update README.rst

added note and links to astropy contributor information

wrapped to 80 characters

@mwcraig some updates to the README on contributing to hopefully be more helpful to new contribu...

Fix another issue with a float used as index

closes #331

This new one is in a test.

added more exmamples

Update AUTHORS and CHANGES [ci skip]

Test for whether path is properly constructed in files_filtered

Add slash so full path is correctly returned

`image_collection.py` already imports path using
from os import listdir, path

@mwcraig -- Thanks! This is definitely a better fix.

added ccd_process to core

Without the slash, the filename is appended directly to the path string.

E.g. for the path re...

Update changelog for 0.4 release

Added a file for Contributors of the Project.

Clean up author list and add it to documentation

Add axis keyword to call to median_absolute_deviation

Closes #251