java: Added Java SWIG binding creation

%init directive is not supported in java so move %init to js/py interface files

Signed-off-by: Alexander Komarov <alexander.komarov@intel.com>
Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>

src/python/mraa.i

@@ -106,3 +106,7 @@ class Spi;
 
 %include ../mraa.i
 
+%init %{
+    //Adding mraa_init() to the module initialisation process
+    mraa_init();
+%}