added builder#pretty
added operation#build

accepts the same local options and/or an optional block
as operation#call, but returns the builder. allows to
inspect the request xml without sending an actual request.
lower timeouts in specs to improve test speed
removed user-specific rspec config
added fuubar for local usage
Revert "added fuubar for local usage"

This reverts commit 9005439d19a490b1d1b84502bc924b8214cf4156.
revert "added a basic contribution guide"

this reverts commit 258904737e62b4d1fddbc26c65ac1737e86cf213.