adds autogenerating xml config to tool under page tool_config
includes basic resource selection config for the tool
updates xml in readme to reflect new config
implements sample return for "add external module" dialogue in canvas under the page lti_launch
implements sample form to take user inuput and use this in adding module item with a "unique" url
Merge pull request #1 from penzance/feature/auto_config

Feature/auto config
Merge branch 'develop' into feature/modules_integration

Conflicts:
	ab_testing_tool/urls.py
	ab_testing_tool/views.py
Merge branch 'feature/modules_integration' of github.com:penzance/ab-testing-tool into feature/modules_integration

Conflicts:
	ab_testing_tool/urls.py