feat(users): send only diff when updating user

SD-219
test(users): fix e2e tests
feat(users): make First/Last name required
fix(users): prefix search phrase with %

SD-222
refactor(users): remove extra get diff method

$http works with own properties so there is no need to filter it
feat(avatar): add modal activity suport for avatar upload
feat(avatar): add initial support for image preview/capture
feat(avatar): add jcrop into upload popup
feat(avatar): add ng-file-upload with drag&drop support
feat(avatar): initial styling for upload modal
refactor(avatar): put upload methods into view
feat(avatar): add crop preview
fix(avatar): make it beta
fix(users): update css action buttons on user screen

sd-214
feat(core): Raven integration implemented.

SD-74: Implement sentry to inform us if users are experiencing errors