Removed 2 duplicate access URLs in default cone search validation list. This has no impact on how the code works.
Fixes to release.py
rename models
correct name
Fix name of model
Merge pull request #1730 from astrofrog/fix-releaser

Fixes to release.py
make coordinates copy if passed into initializer of same coordinate

closes #1727
Added test to make sure coordinates create from other coordinates
Merge pull request #1708 from nden/last-call-for-name-changes-in-modeling

Last call for name changes in modeling
Fix bug in custom_model_1d that meant that parameters set during __init__ were ignored.
Fix a couple of bugs in parameters, specifically with handling defaults.  Turns out Parameters were returning copies of themselves even when being accessed via the class--this is entirely unecessary.  Parameter *descriptors* (unbound parameters) can just return themselves on __get__.  But on bound parameters the default value wasn't being propagated, leading to bugs in trying to implement models with defaults for parameters.
Takes things a little further with default parameter values for custom 1D models by making use of Parameter.default.  Also added in full support for constraints in custom models, and fixed a bug where a ton of globals were being added to the custom model class's __dict__.
Update Mexican hat model parameter name in docstring
Fixed some string -> str instances and add spaces before colon as required by numpydoc
Fixed string -> str to follow numpydoc convention
Fixed integer -> int to follow numpydoc convention
Fixed boolean -> bool to follow numpydoc convention
__init__ docstring should be in class docstring
Merge pull request #1720 from astrofrog/fix-custom-init

Fix bug in custom_model_1d
Merge pull request #1734 from astrofrog/fix-mexican-hat-parameter-name

Update Mexican hat model parameter name in docstring