Improve empty collection check in add_collection.
Add test for add_collection
add default savefig directory
replace tabs with spaces
explicitly missing key or empty str signals to use cwd
PEP8
Implement savefig.directory for tk gui
fix comment in gtk FileChooserDialog: does *not* remember last selected file/directory
Implement savefig.directory for gtk gui
Implement savefig.directory for gtk3 gui
Update CHANGELOG with savefig.directory feature
Split line
Update what's new with savefig.directory feature
Use unicode instead of str
add @cleanup to test_add_collection
Update lib/matplotlib/tests/test_axes.py
Merge pull request #1685 from mspacek/savefig_directory

Add default savefig directory
Merge pull request #1497 from akhmerov/master

Fix for empty collection check in axes.add_collection