Use admin_url() in 'Timber not activated' message in case WP installed at custom path
Merge branch 'admin-notices' of github.com:andyford/timber into andyford-admin-notices

* 'admin-notices' of github.com:andyford/timber:
  Use admin_url() in 'Timber not activated' message in case WP installed at custom path
placing path inside of admin_url() function
Merge branch 'andyford-admin-notices'

* andyford-admin-notices:
  placing path inside of admin_url() function
  Use admin_url() in 'Timber not activated' message in case WP installed at custom path