minor improvement in progress indicator when dropping a single element
fixed #65
removed unneccesary name check when created dialog in multi-tab UI
minor improvement in progress indicator when deleting postgis tables
Catalog dialog now remembers last catalog name
made packaging script ignore test folder

added some comments in code
more tests
Fixed #72 (issue with layer containing blank spaces in their QGIS name)
fixed indentation
Force names without blankspaces in gs layer group dialog

Add some tests for the layer group dialog also
better handling of overwriting when uploading to catalog

Fixes #74 and #75

Includes some code cleaning as well
documented overwrite behaviour and config option for overwriting on group import
add nose tests, closes #70