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

Enable CSS selectors for checkboxes.
removed focus tag
updated page_navigation dependency
updated populate_page_with to check visibility
using latest watir-webdriver
prep for release
fixing travis ci build status image and link
Merge pull request #172 from Conky5/master

Fix travis CI image
added example using data_field
updated to latest selenium-webdriver
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.