Edit link next to graph title.

Closes #44
Dashboard are now the root url

Closes #46
Graph edit view should sort all options alphabetically

Closes #43
Hide the hover menu when mouse leaves graph.

Closes #41
Show the total value for area charts

Closes #40
Draw a vertical line for the current day.

Partially addresses #35
Refactor the way we render graphs and metrics to make it dryer
Handle server errors when loading the graph

Related to #32
Error handling for bad syntax in metric

Closes #32