adjust travis test matrix to server 5.4,5.5 drop

use strict comparison and replace deprecated static method call

remove localStorage clearing part cause of move to sessionStorage

use NC default background color for Mail favicons

fix nc branding

add LGTM bot

Tipsy tooltip

use simpler background fetcher and fetch incoming messages too

delay app start until the page has been fully loaded

inject prefilled data

replace Util::imagePath with OCP\IURLGenerator::imagePath

replace Util::linkToRoute with IUrlGenerator::linkToRoute

Fix requirejs for other locations than apps/

clean up travis file and fix PostgreSQL

attachment style fixes

Load accounts with index page