0.5.1

- Included a series of images that are smaller info-graphic pieces that appear within each tower.
- Default colours are now set as SCSS variables.
- Towers can be scrolled which sets new translation values to create the idea of the camera panning up or down.
- Added a simple decoration in the top part of the page. Not so sure about this. Wanted to create something a little more intuitive.
- Shrank the width of the percentage indicators to make room for the image based info-graphic pieces.
- Percentage indicators now fill to a percentage of the whole tower and not just the visible space.
- Tower background colours change as they gain focus.
- Added the tower scroll JavaScript which effectively adds and removes two classes: `up1` and `up2`.