Merge pull request #30 from collenjones/master

Sorting is working, dates are showing correctly
Dataset description well work
Merge branch 'master' of https://github.com/Datsy/front-end
Finished formating the data set description wells on the explore page
Merge pull request #31 from collenjones/master

Hide 2axes button if only one series selected
More testing - cart model
Merge branch 'master' of https://github.com/Datsy/front-end
Moved server spec test to its own folder
Clearing the column cart also clears the stored data for visualizations, if it exists
Selected a column to be added to cart disables the button. Clearning the cart enables it again
Cart model testing
Build a nicer README.
Commit before pull upstream
Merge branch 'master' of https://github.com/Datsy/front-end