Merge pull request #47 from wbprice/polish

Polish
Merge pull request #52 from wbprice/gh-pages

sponsors section
CSS style fixes and addex xtuple
Merge pull request #58 from stanzheng/gh-pages

CSS style fixes and addex xtuple
add inmotion hosting logo, reorganize sponsors according to @kmcurry comment in issue #49.
add inmotion logo, reorganize sponsors as laid out by @kmcury in issue #49