Start of generating bubble chart for exploration.
Merge branch 'master' of https://github.com/joeandaverde/half-empty
Added bubble exploration chart.
Merge branch 'master' of https://github.com/joeandaverde/half-empty

Conflicts:
	controllers/analyze.js
Merge branch 'master' into bubble

Conflicts:
	assets/css/main.styl
Closer to having tweetsAgo caculations work properly.
Clean up bubble data point creation.
Fixed off-by-one-error in tweetsAgo calculation.
Improved granularity of score calculation.
Merge branch 'master' of https://github.com/joeandaverde/half-empty

Conflicts:
	controllers/analyze.js
Remove legend/credits.