updated path to edit-sources view of etl
added widget creation section to README
moved dt-overview to widgets folder
fixed path to template files in karma config
jshint fixes
changed uri interpolation syntax
changed back to old format
added get-uri service
added defaults to dtFormatters
added 'default' key to overview definition object
fixed get-uri module
fixed get-uri methods
added defaults to overview widget
more tests for overview model