Implement 'r'
Tests
Test shim to get command mode input keys working
Don't overrun a line with replace
Merge branch 'master' into implement-r
Test moving to end of last word in file with 'w'
Fix moving to end of last word in file with 'w'
Move the cursor directly
Group early returns
:lipstick:
Update changelog
Merge pull request #138 from atom/implement-r

Implement 'r'
Merge pull request #153 from dougblack/delete-last-word-in-file

Delete last word in file, fixes #126
Update the changelog for #153
Add = (auto-indent) operator, x'd specs for it

The functionality seems to work, but this isn't ready to merge in
without some specs.
Add more tests for auto-indent, un-x previous spec

This changes the specs to use the JS grammer, as per @mcolyer's
suggestion. It also copies the format of the indent (>) and outdent (<)
tests by checking both multiple line indentation (2==) and the undo
functionality.
Reset the editor's grammar after each = spec
Add note in doc/operators.md about auto-indent