Merge pull request #13 from chriscalip/master

#12 added hook_requirements implementation (site builder ux)
Fix RelayState at sso

Don't use REQUEST_URI as RelayState parameter of the AuthNRequest since the acs uses drupal_goto method and not redirect.

Set the target url assigning a destination parameter. For example:
https://sp.example.com/drupal/?q=onelogin_saml/sso&destination=admin/modules
Merge branch 'master', remote-tracking branch 'upstream/master'
#14 'Log in using SAML' uses drupal_get_destination for destination query logic.