social networks RST
per RST, renamed rev_geo to gis_tools, updated README, and edited stderr statment in rev_geo.py
updated README
updated ipynb
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
added README, fixed a few typos
fill out pandas readme