Add a lint indicator for Interactive Linter linting.

Removes default Brackets lint status indicator.
Replaces the errorIndicator with this lintIndicator.
Resolve magic number for hiding of Brackets inspection status.
Copy status images from Brackets for use on non-linux machines.
Animate linter indicator when an error occurs (once) and do so using AnimationUtils.
Merge branch 'master' into mark/61-custom-lint-indicator

Conflicts:
	main.js
Disable 'Enable Linting On Save' menu item.
Clean up require and remove merge error.
Move function definitions and properly format variables.
Group require statements and change status of indicator from class to attribute.
Move animation out of pulse class and into error status.

Removed dependency on AnimationUtils and lodash.
Merge pull request #62 from MiguelCastillo/mark/61-custom-lint-indicator

Add a lint indicator that replaces Brackets lint indicator