Issue #12: Added twitter block.
	new file:   sites/all/modules/features/twitter/twitter.features.filter.inc
	new file:   sites/all/modules/features/twitter/twitter.info
	new file:   sites/all/modules/features/twitter/twitter.module
Issue #12: Added twitter block for the landing pages.

	modified:   sites/all/modules/features/blog_landing_page/blog_landing_page.info
	modified:   sites/all/modules/features/blog_landing_page/blog_landing_page.pages_default.inc
	modified:   sites/all/modules/features/community_landing_page/community_landing_page.info
	modified:   sites/all/modules/features/community_landing_page/community_landing_page.pages_default.inc
	modified:   sites/all/modules/features/location/location.info
	modified:   sites/all/modules/features/location/location.pages_default.inc
	modified:   sites/all/modules/features/sponsor_landing_page/sponsor_landing_page.info
	modified:   sites/all/modules/features/sponsor_landing_page/sponsor_landing_page.pages_default.inc