Update and re-enable gemini

This commit updates gemini to the fresh 0.6.2, enables tests on Travis
CI and tweaks config to run faster on SauceLabs.

Retries are disabled because in some cases they may cause command to be
executed twice.

Travis script is also fixed to correctly add dynamic capabilites to the
.gemini.yml instead of overwriting them.
Fix input tests

With new gemini each mouseDown should have closing mouseUp
Fix popup tests

There was no delay for animation
Update button screenshots
Update checkbox-group screenshots
Update checkbox images
Update dropdown screenshots
Update icon screenshots
Update input screenshots

Rise tolerance to aviod fails on blinking cursor
Update link screenshots
Update menu screenshots
Update popup screenshots
Update radio-group screenshots
Publish report on failure
Update select screenshots
Merge pull request #931 from bem/fix/sauce-timeouts

Update and re-enable gemini