- rename wait() to get() (wait is available as an alias for now)
- add switch_args() helper that passes its arguments as a tuple to switch
- __nonzero__() and waiting property are gone
- ready() and successful() methods are added for completeness

- it's only used in once place and useless on its own

- wrap_ssl is still available as an alias but will be removed soon

import constants from stdlib's socket into gevent.socket. Thanks to Matt Goodall for the original patch.

- this leads to better error information, esp. with easy_install which suppresses stackrace