Implemented "onExpire" callback hooks.
Merge branch 'feature-onExpire'

Conflicts:
	bower.json
	coverage/index.html
	coverage/src/angular-cache.js.html
	coverage/src/index.html
	dist/angular-cache-1.0.0-rc.2-SNAPSHOT.js
	dist/angular-cache-1.0.1-SNAPSHOT.js
	dist/angular-cache-1.0.1-SNAPSHOT.min.js
	dist/angular-cache-1.1.0-SNAPSHOT.js
	docs/$AngularCacheFactoryProvider.html
	docs/AngularCache.html
	docs/AngularCacheFactory.html
	docs/angular-cache-1.0.0-rc.2-SNAPSHOT.js.html
	docs/angular-cache-1.0.1-SNAPSHOT.js.html
	docs/angular-cache-1.1.0-SNAPSHOT.js.html
	docs/index.html
	docs/module-angular-cache.html
	package.json