Set the error message when a session's attempt to change pages times out.
Merge remote branch 'upstream/master'
Merge remote branch 'upstream/master'
Merge branch 'master' of github.com:bairyn/gless
Warn the user if attempting to click an element fails because it doesn't exist.
Warn the user if attempting to click an element fails because it doesn't exist.
Merge branch 'master' of github.com:bairyn/gless
Emit a helpful error message when watir-webdriver throws a NotFound exception in change_pages.

Previously, when an element with a :click_destination was clicked, and the
validators for the target page were incorrect, an UnknownObjectException was
thrown.
Session#change_pages: don't yield without a block.
Add optional support to change_pages to WrapWatir#click_once.
Improve time-out error message.
Add deep_merge to config.
Merge remote-tracking branch 'upstream/master'
Merge pull request #5 from bairyn/master

Better error reporting, deep_merge, click_once with change_pages