zoom feature needs big and small versions of the image. Updated MosaicMaker to generate a large and small version. added path_small column to Mosaic table. updated Mosaic create method to pass both path attributes to the mosaic instance.
added elevatezoom.js jQuery plug in to zoom on mouseover of mosaic. simple zoom implemented on show page for now.
added pages controller and root to: pages#index. added site nav. partialled off the navs etc from the layout into views/shared for easier  management