.brew: Install PHP 5.5
.gitattributes: Disable normalizing line endings globally

Instead of removing `~/.gitattributes` completely, I decided to just comment out the `* text=auto` line. This makes it easier to temporarily re-enable the setting should I ever want to.

Closes #149.
Add Brew autocomplete.
Merge commit '0f6def1611d73e04877e9d78febf7629c01ed7b4'

* commit '0f6def1611d73e04877e9d78febf7629c01ed7b4':
  .gitattributes: Disable normalizing line endings globally
  .brew: Install PHP 5.5

Conflicts:
	.brew
	.gitattributes