fixing clone-for for tab content in dataset page; fixes #333
Merge pull request #334 from onaio/333_datasetpage_tablinks_fix

This PR should fix the fact that the tab links in the dataset page aren't currently working.
WM: Dropdown+button for datasets source file options
WM: Separated project settings btn from dropdown, forms page
WM: Updated datasets sidebar dropdown options
WM: Added info legend to map container
WM: Legend navigatio bar
WM: Info toggler for legend
WM: Viewby button on map