Merge pull request #14 from aenario/feature/interapp

Added routes to update/delete tasks even if we don't know the list's id
Merge pull request #15 from aenario/bugfixe/multiple

fix #13
Merge branch 'development'
change cozy cloud url in the README
build brunch + code style
do not set content type as json
remove content type as application/json if request is GET or DELETE
add commands: init and cleandb
debug database tool
debug the fact that all list was not selected when app is loaded
debug test in todo list widget (handle when todo list model is null)
do not allow empty tags
do not allow empty tags #16
add installation section and rename old one
Merge branch 'master' of github.com:mycozycloud/cozy-todos
simplify and improve add task UX

always show input field to add a new task
allow to navigate to it via arrows
display blue border when focused
change placeholder by an HTML5 one
better tag management: small refactoring + debug tag removal #5 #17
debug regression about task creation
handle tag list changes when a task is created or deleted
debug first task change problem