Add IE6 logo

Ran through ImageOptim.app
Merge pull request #13 from Krinkle/ie6

Add IE6 logo
Optimize SVGs
Add `opera-next.svg`
Merge pull request #19 from alrra/optimize-svgs

Optimize SVGs
Merge pull request #20 from alrra/opera-next-svg

Add `opera-next.svg`
Add Internet Explorer 10 logo

Thanks @pankajparashar for the links.

Fix #16.
Update to new Opera logo
Add script to generate the `all-desktop.png` image

Fix #27.
Update `all-desktop.png`
Update Firefox logos

Further details:
* http://blog.seanmartell.com/2013/06/27/rebuilding-a-simplified-firefox-logo/
* http://www.mozilla.org/en-US/styleguide/identity/firefox/channels/
* https://blog.mozilla.org/creative/2013/06/27/a-new-firefox-logo-for-a-new-firefox-era/

Fix #25.
Readme.md: inline ALL the images
Update Readme.md

repo maintained by @alrra
Update Readme.md
Update Opera Next logo & add Opera Developer logo

Close #28.
Fix #23.
Remove outdated Maxthon logo
Rename and update the Internet Explorer logos

* Rename images to correctly reflect the Internet Explorer version.
* Replace logos where possible with higher resolution ones.
Replace logos where possible with higher-res ones
Move browser logos into their own directory

This change makes it easier to group together different
sizes and image formats of the same logo.
Add Midori logo