refactor/accounts (#120)

* style(ui): adding divider for login with.

* login_user.html
* register_user.html

* style(ui): 'login with' hyperlink same style as button.

style(css): adding semantic ui css class.

* build: restricting the version for docker-services-cli

the new release was not stable.

setup.py

@@ -17,6 +17,8 @@ history = open("CHANGES.rst").read()
 
 tests_require = [
     "pytest-invenio>=1.4.0",
+    # TODO: remove once a new release is out
+    'docker-services-cli>=0.2.1,<0.3.0',
 ]
 
 extras_require = {