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
Implementation of secure param for PageUrlAnnotation.
Renamed classes and introduced Normalizer.
Fixed tests (added mocks).

Still missing new tests for new classes and PHPDoc.
Added missing tests.
Few corrections.

Corrected exception text, shortened some variable names and removed config dependency from normalizer.
Removed dependency of UrlFactory in Normalizer.
Added test cases and exception.