Bump version to 0.6.7
Update changes
Fixing hash typo on Cookie#add
Merge pull request #245 from robertodecurnex/master

Fixing hash typo on Cookie#add
build_xpath never receives index, remove dead code
make :xpath and :css equal

now both of them work on all elements and can be combined with the same
selectors
bump watirspec
changelog for :css selector improvements