Merge pull request #693 from dshiga/issue-684

angle_utilities - fix to enable padding of negative angles
Merge pull request #690 from astrofrog/tests/fix-travis-timeout

Don't make pip install quiet in ``.travis.yml``, otherwise Travis times out
Merge pull request #659 from astrofrog/refactor-io-framework

Refactor I/O framework
Conflicts:

	CHANGES.rst
Merge pull request #689 from astrofrog/docs/fix-sidebar-issue

Fix issue with sidebar on front page of docs
Merge pull request #678 from eteq/nddata/nddata_arithmetic-2

Miscellaneous tweaks/fixes for NDData
Merge pull request #688 from astrofrog/config/fix-config-file-affiliated

Fix generate_default_config to work with affiliated packages
Merge pull request #673 from mdboom/testing/open-files-lsof

Adds "unclosed file detection" to the test framework using lsof
Merge pull request #698 from hamogu/docutypo

sigma_slip was moved to stats -> change docstring accordingly
Merge pull request #672 from mdboom/unit/long_int_handling

Unit conversion on quantities mishandles long values