Added static typing to servo and spi blocks.

blocks/arduino/servo.js

@@ -54,5 +54,11 @@ Blockly.Blocks['servo_read'] = {
         .appendField(new Blockly.FieldDropdown(profile.default.pwm), 'SERVO_PIN');
     this.setOutput(true, 'Number');
     this.setTooltip('Read a Servo angle');
+  },
+  /**
+   * Retrieves the type of the block, in this case an integer.
+   */
+  getType: function() {
+    return 'int';
   }
 };

blocks/arduino/spi.js

@@ -74,5 +74,13 @@ Blockly.Blocks['spi_transfer'] = {
     this.setPreviousStatement(true, null);
     this.setNextStatement(true, null);
     this.setTooltip('Send SPI message to an specified slave device');
+  },
+  /**
+   * Retrieves the type of the selected variable, Arduino code returns a byte,
+   * for now set it to integer..
+   * @this Blockly.Block
+   */
+  getType: function() {
+    return "int";
   }
 };