Top shares widget

Create widget to display top shares by usage
Sort share data by usage
Render flot chart to display top 5 shares
Merge branch 'master' into issue#49_top_shares
Fixes #244
Fix scan command for CLI.
Update disk API to make the scan an explicit command. Also remove the trailing
slash for url endpoints.
Update disk include in the main urls file
Update webui for backend disk api changes
Update disks console for backend api changes
Fixes #289

Fix pools add, list and delete command for CLI.
Merged conflicts.
Fixes #289

Add exception handling for pools.
Merge branch 'master' into issue#49_top_shares

Conflicts:
	src/rockstor/templates/storageadmin/css/style.css
Merge branch 'issue#289_pools_imp' of git://github.com/aliamir/rockstor-core into aliamir-issue#289_pools_imp
Top shares widget

Display top shares list with bar graph for % used
Merge branch 'master' into aliamir-issue#289_pools_imp
Merge branch 'master' into issue#49_top_shares
Don't save error file when the api returns error dictionary.
Handle connection errors in generic api_call
Update print* methods for various infos
Use @api_error in pools console.
update print* methods for consistency.
fix scrub and scrub status.