Incorrect brige of log messages in JUL to SLF4J projects

We have detected that logging from JUL to SLF4J is not working properly in Jersey JAX-RS implementation as described in this reference:

http://blog.cn-consult.dk/2009/03/bridging-javautillogging-to-slf4j.html

Modified init method in order to remove all previous handlers before installing the JUL to SLF4J one.
Merge pull request #10 from borillo/master

Incorrect brige of log messages in JUL to SLF4J projects