Fix broken layout of right top navigation for Chrome (T1107)

Summary:
* the issue was:
  * under certain circumstances the right top navigation layout were broken
    * the user menu button wasn't in the same line as the rest of the menu, instead below
* this happened when:
  * using Chrome (Version 38.0.2125.104, 64-bit; on Ubuntu)
  * you are still signed in form an earlier session
  * opened / refresh the page
* it didn't occur when:
  * using Firefox
  * or when opening the page while you're not signed in (or just sign out) and THEN sign in

* this commit removes the directives for the user-menu and the signin-button and instead moves their html directly inline to the index.html template
  * so it seems that the issue was somehow ng directive related
    * because the markup is the same in both cases
  * this solution is not nice in the long term, since ng directives help you with structuring your app/templates
    * (in particular, directives should work properly at least in Google's own browser :-))

Test Plan:
  * check if top navigation looks good again, especially when
    * you are using Chrome
    * and you are still signed in
    * and you reload the page

Reviewers: seth, shadowhand

Reviewed By: shadowhand

Subscribers: aMoniker, rjmackay

Projects: #ushahidi_client

Maniphest Tasks: T1107

Differential Revision: https://phabricator.ushahidi.com/D502