Updated CONTRIBUTION.md and README.md

Changed text for "Asking Questions" and added same to README.md
Merge pull request #66 from evangelion1204/update_contribution_support_page

Added support page to CONTRIBUTION.md
Fixing "shouldReceive" declaration in class/interface DocBlocks

Closes #70
Fixing "shouldReceive" method declaration (attempt 2)
Update "findAll" method PHPDoc to indicate that $locator can be an array
Safety check for page factory in "createFromNodeElement" methods
Adding "instanceof" checks to be catch any incorrect annotation usage