Merge pull request #36 from sophokles73/osgi_support

fix build problem using Java 7 javac
Fixed Maven dependency versions.
Updated dependency for fixed CoAPs.
Added resource to cf-secure.
Added root info resource with automatic version number.
Added certificates for testing.
Clean-up.
Fix NullPointerException when Config Admin does not provide properties
for managed server instance
Fix endpoint configuration
Make ServerInterface useful for testing purposes, add test cases for
ManagedServer