Fix CONSTRAINTS_DOC formatting in modeling docs
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
Added support for trailing Z in UTC time
Fixed error message, added tests for trailing Z
Ensure name-less columns can be printed, plus test case and bug-fix note.
Don't generate .pyc files when running tests
Added exception test for non-utc
str -> six.text_type, move change to 0.3.2 bug-fix section
Merge pull request #2214 from mdboom/misc/dont-write-pyc

Don't generate .pyc files when running tests
Merge pull request #2213 from mhvk/column-no-name-header

Column with no name cannot be printed
Don't fail -P if docs missing
Update development_workflow.rst

typo fix
Merge pull request #2220 from larrybradley/patch-1

Update development_workflow.rst