Merge pull request #1 from fcanas/master

Add Getting Started instructions to README
cleaner parsing of tweets, cleanup
wrapper function to call streamer from twitter_tools
user external wrapper to call
initial code for searching tweets with geo
support for searching
wrapper script for searching
search moved to different function
minor
README updates
minor internal variable name change
fixing tracking of search times
methods for choosing data and plotting
minor
minor plotting
rmnull by default
make this file for importing
wrapper for selecting and plotting data
move code for showing figure
minor