at checks throw when no checker is defined
add missing space
also throw when one of the "to:" pages does not define an at checker
remove characters accidentally added before
use a page object with at checker to fix test
adapt javadoc
click(? extends Page) does not require at checker
Extract basic waiting stuff to a new module
Merge branch 'undefined-at-checker-throws' of https://github.com/c089/geb
Post merge cleanup
Merge branch 'master' of github.com:geb/geb