NF: added gedit .bashrc, and grin
NF: added links to new sections
NF: added cheat sheet
RF: small style edits
RF: small style edits
RF: last edits to cheatsheet and Readme
Merge pull request #3 from cindeem/lbl-shell

Final edits to Shell tutorial
Merge pull request #3 from cindeem/2013-03-lbl-2

Refactored Shell tutorial