Implemented line chart mvp

Automatically updating line chart that tracks the top five hashtags with a method in the database controller called "calculateTopFiveHashtags." Then sends this info to the line chart view, which renders it using a method called "draw." The liveChart.js
file contains the highchart object.
Populated top hashtags

Added <ul> with top hashtags that automatically populate based on top hashtags passed back from main controller.  Functionality for clicking/reloading chart not yet added.
resolved merge conflict with globe, only changed main controller
Merge pull request #13 from rjbernaldo/initial_highchart

Initial highchart