Add tag filter.

re #22
Add styles and all filter tag.

re #22
Add tagsTemplate

re #22
Merge branch 'master' of github.com:atchai/what-todo

Conflicts:
	bundle.js
	js/collections/todos.js
	js/views/mainview.js
add backend with flask
add package.json to .slugignore
forgot python app module
minify js
refactor make_tags method in flask
refactored views and models into packages
added flask classy, blueprints, app factory pattern
fix db_create.py
add psycopg2 to requirements.txt
add app.py, use app context for db_create
forgot imports on register view
fix paths in gulpfile
remove trailing white spaces