Add CSS support for image.
Update lib/page-object/elements/check_box.rb

Enable CSS selectors for checkboxes.
fixed issue when using page and element accessors
eliminated a little duplication
added support for additional basic elements
getting ready for new release
added step to demonstrate getting the href for a link
merged MassRelevance's pull request
added changelog entry
updated to latest ruby
adding the missing "s" to the define_multiple_watir_accessor method.
Merge pull request #180 from wjpowell/master

corrected a bug in the widgets module for watir
added changelog entry
added license to gemspec
version bump for new release