social networks RST
per RST, renamed rev_geo to gis_tools, updated README, and edited stderr statment in rev_geo.py
Merge remote-tracking branch 'upstream/master'
updated README
updated ipynb
Merge pull request #17 from blehman/master

changed rev_geo to gis_tools
updated README and fixed a few typos in the topic modeling lesson.
created content for bash-201 README
updated links for new directory
updated headings
updated headings
updated headings
updated headings
updated headings
updated headings
updated headings
updated indent
fixed typo
updated title
updated title