add slugs and migrations
update test data with slugs
update urls, forms, and templates for slugs
remove misplaced dataset templates
add forms and views for project and dataset slugs
update url configurations
update project and datset templates with new urls
add some comments
Merge branch 'project-urls-views-forms' into project-urls-all

Conflicts:
	message_coding/apps/dataset/forms.py
	message_coding/apps/dataset/views.py
	message_coding/apps/project/forms.py
Merge branch 'project-urls-urlconfs' into project-urls-all
Merge branch 'project-urls-templates' into project-urls-all
#20 #21: allow users to create a task with selected dataset under a project
Merge branch 'master' into project-urls

Conflicts:
	message_coding/apps/project/urls.py
	message_coding/apps/project/views.py
	message_coding/base/urls.py
	message_coding/base/views.py
	message_coding/message_coding/urls.py
fix project_task url
partial implementation
enhance project and dataset models
coding views
coding urls
update templates also with body_class
coding styles and js