Fix bootstrap issues on Volume Backups dialogs

Cancel buttons on both the Create Backup dialog and the Restore Backup
dialog do not have borders. This patch fixes the problem.

Change-Id: Id86f599ce0fc852b0e73db82099b876a601ecb5f
Closes-Bug: #1359901
Add instructions for packaging JS libs

Since we are going to use xstatic, it's nice to know how to add
new libraries to Horizon.

Change-Id: I04ecfe70c3b5715cf45d97c87113cdd7f53a0435
Merge "Add instructions for packaging JS libs"
Merge "Fix bootstrap issues on Volume Backups dialogs"