grove: Small changes to build grove library

* Removed relay and rotary from grove library
    * Removed relay and rotary from grove SWIG interfaces
    * Fixed warning for o2 printf %
    * Fixed return value warning for _get_normalized method used by
      my analog sensors.

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

examples/c++/relay.cxx

@@ -24,7 +24,7 @@
 
 #include <unistd.h>
 #include <iostream>
-#include "grove.hpp"
+#include "relay.hpp"
 
 int
 main(int argc, char **argv)

examples/c++/rotary.cxx

@@ -25,7 +25,7 @@
 #include <unistd.h>
 #include <iostream>
 #include <iomanip>
-#include "grove.hpp"
+#include "rotary.hpp"
 
 using namespace std;
 

examples/c/o2.c

@@ -59,7 +59,7 @@ int main()
         o2_get_raw_volts(sensor, &raw_volts);
         o2_get_value(sensor, &o2_percent);
 
-        printf("O2 raw volts: %0.03f v, o2: %0.03f %\n",
+        printf("O2 raw volts: %0.03f v, o2: %0.03f %%\n",
                 raw_volts, o2_percent);
 
         usleep(500000);