Added the Papers We Love CO charter
Renamed 4 documents in the distributed_systems folder
Merge pull request #65 from johnclaus/master

Added the Papers We Love CO charter
Merge pull request #66 from eysteinbye/Renaming

Renamed some documents in the distributed_systems folder
Added tw-idf paper
added IR readme with document and explanation
Merge branch 'master' of https://github.com/shriphani/papers-we-love