added info from Grid2 wiki page
Merge remote-tracking branch 'upstream/master'
fixing format error with lists
Update 07_Selenium_Grid.md

fixed some formatting errors after merge.
Merge remote-tracking branch 'upstream/master'
Merge branch 'master' of https://github.com/orieken/selenium-docs
Merge pull request #37 from orieken/master

07_Selenium_Grid