Update Issue 56

Issue 450
JAIN SIP Repo

commit addresses the following:

- uses default key store type if none is specified (fixes http://code.google.com/p/sipservlets/issues/detail?id=191)

- uses default algorithm provided by JVM, instead of forcing the use of SunX509. With this patch non-HotSpot/non-OpenJDK can be used with the DefaultSecurityManager and without explict configuration. Basic tests on IBM JDK ran ok.

- explicit logging warnings when configuration misses parameters

git-svn-id: https://svn.java.net/svn/jsip~svn/trunk@2278 8e71dc83-d81e-6649-80f2-80b843a9b2be