Make a comment clearer
Update CHANGELOG
remove numpy version being treated special
update changelog
add implementation of issue #548
since try_write() is not used anywhere in the module itself, move it to the utils
Check for OSError in try_write instead of IOError
update chnagelog
Have conda clean --lock only search the places where locks could be

This makes it much faster.
Make conda config --get warn on invalid keys
Don't output a --set for an invalid key in conda config --get
Add more tests for conda config
Have run_conda_command return stderr separately
conda config: print an error message to stderr
Update tests for changed run_conda_command
Add Travis to Flowdock
Use py.test instead of nose in Travis
Travis: add debug output
Travis: use setup.py develop

Otherwise, an older Miniconda will downgrade conda when pytest is
installed. This also tests that setup.py developing works, which can't hurt.
Fix tests on Windows