SWIGJAVA: Remove the last JAVA ifdefs from src

Removed all references to #ifdef SWIGJAVA and JAVACALLBACK from the
library source.  All java-specific source code has been moved to the
corresponding library's .i file for java.

    * Update library source
    * Update examples where necessary
    * The function pointer methodology has been remove from libraries
      which provided callbacks as both a class and a function pointer
      implementation.  Examples were updated to use the class version
      of callbacks.
    * Updated documentation for SWIGJAVA

Signed-off-by: Noel Eck <noel.eck@intel.com>

src/mpu9150/mpu9150.cxx

@@ -109,11 +109,9 @@ void MPU9150::getMagnetometer(float *x, float *y, float *z)
     *z = mz;
 }
 
-#ifdef SWIGJAVA
-float *MPU9150::getMagnetometer()
+std::vector<float> MPU9150::getMagnetometer()
 {
-    float *v = new float[3];
+    std::vector<float> v(3);
     getMagnetometer(&v[0], &v[1], &v[2]);
     return v;
 }
-#endif