feat(users): implement user delete via PATCH

do  `PATCH` with `{Active: false}`

close #160
chore(readme): update coverall badge for devel branch
chore(readme): change travis badge to devel too

close #163
fix(test) added clear() for username input form

close #164
test(auth): test failed auth via http backend mock

close #165
test(style): check style of protractor/karma conf files
fix(auth): fix disabled login btn on init

when storing credentials in browser there is no way to login
while the button stays disabled. so instead it's only disabled
when communicating with server