add css and js files for slider plugin
Add pools usage field in pools table.
Remove js and css files not relates to the add pool usage.
Fixes #269

Make shares collection sortable by usage
Fixes #269

Make pool collection sortable by usage
Fixes #269

Make disk stats available in a sorted order using sortby=attribute query
parameter.
Delete deprecated files
Update shares and pools API urls by removing trailing /. Update frontend code accordingly.
Fixes #270

Provide API for current time on server. The command is utcnow and can be made
via POST to /api/commands/utcnow
Rearrange the used size field in pools table.
Merge pull request #266 from Mchakravartula/issue#183_add_pool_usage

Issue#183 add pool usage
Merge pull request #271 from schakrava/issue#269

Issue#269
Merge pull request #272 from schakrava/issue#270

Fixes #270