Increment required selenium version to 2.12

[emanlove]

With the change to using Selenium's Select class we need to increment the minimum selenium version required by Selenium2Library to 'selenium >= 2.12' whuich is the Selenium version which introduced this support code.

[rtomac]

This should happen along with the 1.1 release, correct Ed?

[emanlove]

Yeah, it should. Making the change now and should be merged in shortly.

[rtomac]

Great, thanks.

[emanlove]

Done.