PROTON-217: cmake build system should include install target for Java binaries

git-svn-id: https://svn.apache.org/repos/asf/qpid/proton/trunk@1447221 13f79535-47bb-0310-9956-ffa450edef68
PROTON-242: Shared library used JNI code has poor name "libproton-swig.so"

Shared library now has name libproton-jni.so i.e. follows the naming conventions of its companion jar.

git-svn-id: https://svn.apache.org/repos/asf/qpid/proton/trunk@1447222 13f79535-47bb-0310-9956-ffa450edef68