Merge pull request #8 from tadeegan/master

Front End
Merge pull request #9 from tadeegan/master

active users script
Merge pull request #10 from tadeegan/master

Add active user data and time lapse vis
heapmap & circle
Revert "heapmap & circle"

This reverts commit 8bb9da613f1d0d0096c337dd4db6291af1baeebc.
change gradient function
changed the time lapse to color blue
added button to toggle time lapse
city dots link to respective subreddit and feature city name hovertext
transparent png to hide markers
cleaned up code
merged code
fixed weighting and toggle for heatmap