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Remove outdated Maxthon logo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
Add Yandex (Яндекс) logo
Add Konqueror logo
Update image generator script

Make script generate different sized versions of the original
logos ('16x16', '24x24', '32x32', '48x48', '64x64', '128x128',
'256x256' and '512x512').
Generate different sized versions of the logos
Update README.md