not technically modal, but commits map with polyline from position to guess position that appears upon guess submission.
styles the guess map to make it look more similar to the embedded map.
initial styling of guessScore box.
inserts guess score into guessScore box upon guess submission.
add distance to scored controller and page
Merge branch 'master' of https://github.com/MDCox/planet_darts into guess-modal
Merge pull request #15 from MDCox/guess-modal

No conflicts -- merging new features: score calculations, score map (distance from location), API key, etc