Fix IPython case
Mercurial commands and updates.

Reformat mercurial cheatsheet based on the order of usage. Add and Explain Important mercurial commands.
Merge pull request #92 from orsenthil/master

Mercurial commands and updates.
Rearrange Mercurial
Update Atom.rb

Use "ALT" to "Fold / Unfold current code block".
Merge pull request #93 from klern/patch-1

Update Atom.rb
Added save_and_open_screenshot info to Capybara
Merge pull request #94 from sandrods/master

Added save_and_open_screenshot info to Capybara
The HTTP cookie example line is misplaced

Introduction line and example line of HTTP cookie is misplaced.
Merge pull request #95 from QYL/patch-1

The HTTP cookie example line is misplaced