GUI-55: Elastic IPs Landing Page Redux

Implemented the following for the Elastic IPs landing page per comments in GUI-55…

- Replaced search bar watermark with blank and replaced "Go" button with magnifying glass
- Allow Elastic IP to be associated to or disassociated from an instance
- Allow Elastic IP to be released to cloud.
- Added caret indicator to sorting drop down.
- Added 2-letter indicators on properties view
- Removed "Scope" column on table view (possibly to be reinstated if/when we support VPC).

Not yet developed…
- No help button or help display