Fixed typo in feature description.
Merged two background steps since the last one did not have any actions
that could be done manually.
Removed assertions from a "given" (login) step. We already extensively
test logging in. If this extension needs login tests, they should go to
a separate feature file.
Moved methods from steps file to page file, following page object
pattern.
Change-Id: Ic5250970362718f5ed887c9ac8fd56948724b210
