#9 NullPointerException in SshCipherFactory

[Bénoni Delfosse]

Using version 0.2.6, a NullPointerException occures in
the SshCipherFactory.<clinit> method (called by
SshConnectionProperties.<init>) when trying to get the
"j2ssh.cipher" resources.

The bug was in the
ConfigurationLoader.getExtensionClassLoader() method
because the 'ext' variable was never initialized.

So, the patch add the initialization step before
returning the variable 'ext'.

[Bénoni Delfosse]

The diff file between the original (0.2.6 version) and my modified version