Module clean up. Moved masonry instantiation out of app.js into own file (js/modules/lib/masonry). Defined `init` methods for modules to make them more structurally intuitive.
Moved great deal of image centering logic out of textpicColumns.js and into services/centering.js
identified resuable regex code and moved it into its own service
Added regex.js to list of "build" files in gulp tasks
Changed craigslist-map jade template to give masonry wrapper an attr of `[masonry-wrapper]` so JS can select all elements with these attrs, rather than classes. Improved interaction of modules to achieve image centering.