Release v0.2.54

Merge pull request #329 from panoptes/add-different-object-detection

* Add detect_sources function as a quick way to get sources in a fits image using the sep library. Note that this doesn't do much with the background and the bayer array and should mostly be considered a quick-look method.

Merge branch 'release-v0.2.52' into develop

v0.2.52 - #324, #325, #326, #327, #328

Fix formatting in CHANGELOG for dependency pinning

Quick fix for changelog

Merge branch 'release-v0.2.49' (really `v0.2.50) into develop

Merge branch 'release-v0.2.49'

Merge branch 'release-v0.2.49'

v0.2.48 (#315)

* Fix get quantity value (#313)

* If returning a numpy float, make a normal float.
* More coverage on doctest

* Changing print -> logger

Fix get quantity value (#313) (#314)

* If returning a numpy float, make a normal float.
* More coverage on doctest