Added rough version of "Upped" logo.

`README.md`: Added PhoneGap build commands

Updated Ionicons from 1.4.1 to 1.5.2 (and modified `gulpfile.js` to reflect this)

Added `swipe-stack-0.1.js` library (and CSS): a custom, messy, uncommitted fork of https://github.com/cferdinandi/slider

`gulpfile.js`: Updated Ionicons version number, added `swipe-stack` JS & CSS

`app.jsx`: new stubbed data

Added 3 demo images (.jpg) to go with stubbed data

`locations.jsx`: many changes, this is currently the heart of the new app code; to be renamed

`_styles.scss`: started move to new app color scheme

`app.scss`: lots of new CSS (mostly a bit quick-and-dirty) for new swipe stack functionality, plus a little bit more for new colors & new logo (more to come)