Implements hook_enable().
Import breakpoints from all enabled themes.
@todo: This should be removed if https://drupal.org/node/1813100 is resolved.
function breakpoint_enable() {
// Import breakpoints from themes.
$themes = list_themes();
_breakpoint_theme_enabled(array_keys($themes));
// Import breakpoints from modules.
_breakpoint_modules_enabled(array_keys(Drupal::moduleHandler()
->getModuleList()));
}