update sponsor page

- add tiers for each sponsorship level
- add sponsors who are PIF
more sponsor updates

- removed old EDB logo; we're not using it anyway
- add Javelin logo with transparent bkg
- resized Javelin & OmniTi to more appropriate size for webpage
- add OmniTi to sponsor bar + page
Merge pull request #10 from gorthx/master

update sponsor page