Jadler modularization; copyright year fix. Closes #30

modularization introduced. Jadler now consists of two modules, jadler-core and jadler-jetty, both packed in a jadler-pom module. There is a special jadler-all module which contains all integration tests and depends on both jadler-core and jadler-jetty. This module can be used as a maven dependency so you get whole jadler automatically.

@Benky, @liry, what do you think about it?