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
Merge branch 'master' into issue#49_top_shares

Conflicts:
	src/rockstor/templates/storageadmin/css/style.css
Top shares widget

Display top shares list with bar graph for % used
Merge branch 'master' into issue#49_top_shares
Top shares widget

Display top shares used %
Display bar graph of used %
Use d3-tip to show tooltip with used and free space
Top shares

Correct height of svg to accomodate title + data.length
Change colors of used and unused bars
Handle resize and add legend
Modify tooltip style
Top shares

Reduce barHeight and rowHeight.
Modify colors for used and unused
Modified md5sum for js-lib (d3-tip.js added )
Merge branch 'issue#49_top_shares' of git://github.com/sujeetsr/rockstor-core into sujeetsr-issue#49_top_shares
Modify md5sum for js-lib (d3-tip added)
bugfix: Fix broken resize for cloned shares.
Merge branch 'issue#49_top_shares' of git://github.com/sujeetsr/rockstor-core into sujeetsr-issue#49_top_shares
Top shares

Move storage to first category in widget selection list
Add disk activity and top shares as default widgets
Display used and free next to share name
Truncate share name to 15 chars
Merge branch 'issue#49_top_shares' of github.com:sujeetsr/rockstor-core into issue#49_top_shares