Add toast component interactions

Include boostrap toast component to communicate success
and error requests on the local user management page.

- Created BVToastMixin to share initialization options
- Used async/await pattern to make sure toasts are shown
  after asynchronous calls are complete
- Followed current AngularJS pattern of manual dismiss for
  error toast and automatic dismiss for success toast

Signed-off-by: Yoshie Muranaka <yoshiemuranaka@gmail.com>
Change-Id: I5d5c037b5f41781972106fb5e9a2096cc72c39ab
diff --git a/src/assets/styles/_obmc-custom.scss b/src/assets/styles/_obmc-custom.scss
index d20e64e..2e36019 100644
--- a/src/assets/styles/_obmc-custom.scss
+++ b/src/assets/styles/_obmc-custom.scss
@@ -56,4 +56,5 @@
 @import "./buttons";
 @import "./form-components";
 @import "./modal";
-@import "./table";
\ No newline at end of file
+@import "./table";
+@import "./toast";
\ No newline at end of file