Tweaks

This pull request implements the tweaks that I requested on the Google gorup thread (https://groups.google.com/forum/#!topic/pdxhackerspace/zzfP3gBaCZU).  Specifically, I have added a transparent background over the "jumbotron" object on the index page to ease the difficulty in reading the white text over the jumbotron photo.  Additionally, the logo has been modified such that the "grounds" in the schematic have a opaque to transparent gradient applied.  This should ease the transition between the menu section of pages and the beginning of content.