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/mma7455/mma7455.cxx

@@ -26,6 +26,7 @@
 #include <string>
 #include <stdexcept>
 #include <unistd.h>
+#include <vector>
 #include <stdlib.h>
 #include <string.h>
 #include <math.h>
@@ -133,13 +134,11 @@ MMA7455::readData (short * ptrX, short * ptrY, short * ptrZ) {
     return mraa::SUCCESS;
 }
 
-#ifdef SWIGJAVA
-short *MMA7455::readData() {
-    short *v = new short[3];
+std::vector<short> MMA7455::readData() {
+    std::vector<short> v(3);
     readData(&v[0], &v[1], &v[2]);
     return v;
 }
-#endif
 
 int
 MMA7455::i2cReadReg (unsigned char reg, uint8_t *buffer, int len) {