vos_catalog.py: fix use of format() for compat with python 2.6
another {} format() problem in test_cosmology
status -> "param_jac" in NonLinearLSQFitter
Add param_cov to fit_info
Added  documentation for `fit_info`
Added test for param_cov
fix error in errorfunc usage revealed by tests
change param_jac to cov_x, because it's not really a jacobian
Fixed formatting with colons issue#2183
test file for checking coordinate colon issue
Update angle_utilities.py

Added spaces after comma
Updated CHANGES.rst for coordinates formatting
Merge branch 'master' of https://github.com/QuanTakeuchi/astropy
Added test to check formatting with colon
Delete test_colon.py
Undo added test_colon

Adding the test to test_formatting.py instead
Adding test_to_string_fields_colon
Used nested ifs
Merge pull request #2197 from QuanTakeuchi/master

Issue with formatting coordinates with colons #2183
Added support for trailing Z in UTC time