Ensure no Python modules under astropy/utils/compat are excluded from the source distribution
Added a changelog mention of this, though it won't be of interest to most users (packagers maybe though)
Should fix the reference cycle found in #2877 by storing parent_table as a weakref.  This is achievable since most of the Column class seems to work find if there isn't a parent_table.  Also makes parent_table a property, allowing minimal changes elsewhere.
Add changelog entry [skip ci]
Merge pull request #2879 from embray/table/reference-cycle

Fix reference cycle between Table and Column
Merge pull request #2854 from embray/issue-2854

Astropy 0.4.1 on pypi is broken for python 2.6 due to missing _odict_py2 _fractions_py2 directories
correct 1 typo in docstring

@embray

[skip ci]
Merge pull request #2899 from hamogu/patch-2

correct 1 typo in docstring
Make weights keyword work in LEVMArLSQFitter
Fix extra white space in empty line
Merge pull request #2900 from hamogu/fix2900

fitting with weights does not work
Provide more detailed feedback about deprecated units.
Suggest alternative units that require scaling the data.
Add CHANGES entry