fix($cookies): set cookies on Safari&IE when base[href] is undefined

Safari and IE don't like being told to store cookies with path set to
undefined. This change ensures that if base[href] (from which cookie path
is derived) is undefined then the cookie path defaults to ''.

The test verifies that the cookie is set instead of checking that cookie has correct path,
this is due to that cookie meta information is not avabile once the cookie is set.

Closes #1190, #1191