Standardize "use strict".

All modules should have a "use strict"; at the top of the file.
Merge pull request #88 from MiguelCastillo/mark/use-standard-strict

Standardize "use strict".
Merge branch 'master' into mark/use-codeinspection

Conflicts:
	linterSettings.js
	pluginManager.js
	plugins/jscs/groomer.js
	plugins/jshint/groomer.js
	plugins/jslint/groomer.js
	plugins/jsonlint/groomer.js