Updates to Transportation Section. AsyncExcelLoader implemented to pull Excel table from URL to Device Folder. In MainActivity, Implemented code to read from Excel Folder and build Art Venue Objects, though this will be changed to read into a backend SQL style database on the phone with a cursor. Discover section adapted to work with ArtVenueapproach, will need to be changed to work with cursor approach instead.
Bookmark Image Buttons added to Favorites section of left nav drawer, sized correctly. They call back to the main activity when they are clicked, and can be initialized from the Main Activity with the correct images through the constructor of the BookmarkItem when it's added to the ItemArrayAdapter
Merge branch 'master' of https://github.com/sdgennari/CVilleArt

Merge Necessary because local code was behind the main branch. This merge enables the upload of the AsyncExcelLoader commit and the Bookmarks commit.

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