graph: first iteration of a graph widget

refs #3
graph: add to sample dashboard

refs #3
graph: add bg color

refs #3
graph: title not needed for now

refs #3
graph: config example for nero widget

refs #3
Application.css: resizing nero widget, fixing pageload positioning
Fixing twitter widget, graph widget working
Merge pull request #8 from osuosl/issues/3/graph_widget

Issues/3/graph widget