Replacing inline JS with ES 2015 functions included in pages/sessions/new. Also applying suggested server-side syntax improvements to OmniAuthCallbacksController.

If window.location contains a URL fragment, append the fragment to all sign-in forms, the sign-up form, and all button based providers.

When sign-in is disabled:
 - skip password expiration checks
 - prevent password reset requests
 - don’t show Password tab in User Settings
 - don’t allow login with username/password for Git over HTTP requests
 - render 404 on requests to Profiles::PasswordsController

When ldap is enabled and use "Standard" authentication method, if authentication fails
the correct tab remain selected.
This is done by saving into localStorage when the active tab changes and by always selecting that tab when
the page is loaded.

- Tab between register and sign in forms
- Add individual input validation error messages
- Validate username
- Update many styles for all login-box forms

This reverts commit 3e991230.

# Conflicts:
#	app/models/project.rb

We were doing all kinds of code gymnastics to "enable" Crowd in the
feature spec and this would sometimes cause a transient failure.

Really what it's testing is if the Crowd login form shows when Crowd's
enabled, so this is much better suited to a view spec.

Avoids an empty Sign in box when signup_enabled? is false, and avoids
showing "No authentication methods configured" unless there really are none.

OmniAuth signin gets its own file for consistency with signin and signup and LDAP.

Fix 500 error on login page if ldap enabled and sign-in disabled

Related to gitlab/gitlabhq#1701

See merge request !1209

Signed-off-by: NDmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

These changes are ported from EE to CE. Apply changes for app directory

Signed-off-by: NDmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Signed-off-by: NDmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Signed-off-by: NDmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Signed-off-by: NDmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Signed-off-by: NDmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>