Merge pull request #2 from dkflame/master

add TSP
Added data collection script.
Added a load data function to collect_data.py
Changed default action in collect_data.py from collecting data to loading saved data.
Added sparse Topic-Specific PageRank implementation.
Fixed teleport calculation in TSPR.
Added a field in the user information dictionary to store the distribution of cameras used per category.
Added function to combine all data, and one to run PageRank from end to end.