Handle LDAP missing credentials error with a flash message.

Create the githost.log file if necessary.

Issues API

This resolves issue #1121.
Signed-off-by: Pat Thoyts <patthoyts@users.sourceforge.net>

If a user fails to provide a username or password to the LDAP login
form then a 500 error is returned due to an exception being raised
in omniauth-ldap. This gem has been amended to use the omniauth
error propagation function (fail!) to pass this exception message to
the registered omniauth failure handler so that the Rails application
can handle it approriately.

The failure function now knows about standard exceptions and no longer
requires a specific check for the OmniAuth::Error exception added by
commit f322975c.

This resolves issue #1077.
Signed-off-by: Pat Thoyts <patthoyts@users.sourceforge.net>

Fix english on the edit user form.

Signed-off-by: Pat Thoyts <patthoyts@users.sourceforge.net>

Controllers refactoring with contexts
Move commit compare logic to model

Fixing MySQL syntax error

show flash notice after deletion of a project

Improve handling of misconfigured LDAP accounts.

Gitlab requires an email address for all user accounts as this is the
default account id and is used for sending notifications. LDAP accounts
may be missing email fields so handle this by showing a sensible error
message before redirecting to the login screen again.

Resolves github issue #899
Signed-off-by: Pat Thoyts <patthoyts@users.sourceforge.net>