Make Net_SSH2::isConnected() return a boolean instead of int.
Merge pull request #414 from bantu/SSH2-isConnected-bool

Make Net_SSH2::isConnected() return a boolean instead of int.

* bantu/SSH2-isConnected-bool:
  Make Net_SSH2::isConnected() return a boolean instead of int.
Merge branch 'master' into php5

* master:
  Make Net_SSH2::isConnected() return a boolean instead of int.