View by menu: renders questions and send a :view-by event, which is just console-logged atm.
Coloring markers according to view-by. Interacts weirdly with hover/click coloring though :(
Fixing the interactions between view-by and hover/click event coloring
minor cleanup; is-clicked? was moved to top level
Adding a super basic view-by legend.
combining the two components back into one
Better html / css for the legend
Changing names -> labels for select one and select all that apply answers.
minor cleanup
Dropdown to drop-hover
PLD: pull out color palette list
PLD: own line comments with 2 parens via style guide
Merge pull request #555 from onaio/523_view_by

523 view by