cpp_headers: Renamed C++ headers from .h -> .hpp

To make room for UPM C and C++ sensor code to coexist, all UPM
C++ headers have been renamed from h -> hpp.  This commit contains
updates to documentation, includes, cmake collateral, examples, and
swig interface files.

    * Renamed all cxx/cpp header files which contain the string
    'copyright intel' from .h -> .hpp (if not already hpp).

    * Replaced all references to .h with .hpp in documentation,
    source files, cmake collateral, example code, and swig interface
    files.

    * Replaced cmake variable module_h with module_hpp.

    * Intentionally left upm.h since this file currently does not
    contain code (documentation only).

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

src/rotaryencoder/rotaryencoder.hpp

@@ -0,0 +1,105 @@
+/*
+ * Author: Jon Trulson <jtrulson@ics.com>
+ * Copyright (c) 2015 Intel Corporation.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+#pragma once
+
+#include <string>
+#include <stdint.h>
+#include <sys/time.h>
+#include <mraa/gpio.h>
+
+namespace upm {
+
+/**
+ * @brief Grove Rotary Encoder library
+ * @defgroup rotaryencoder libupm-rotaryencoder
+ * @ingroup seeed gpio other hak
+ */
+/**
+ * @library rotaryencoder
+ * @sensor rotaryencoder
+ * @comname Grove Rotary Encoder
+ * @type other
+ * @man seeed
+ * @web http://www.seeedstudio.com/wiki/Grove_-_Encoder
+ * @con gpio
+ * @kit hak
+ *
+ * @brief API for the Grove Rotary Encoder
+ * 
+ * UPM module for the Grove rotary encoder. This rotary encoder
+ * encodes a rotation signal into electronic pulses that can be used
+ * to measure rotation and direction. It is useful in cases where a
+ * rotary knob is required, but using a potentiometer is not
+ * desirable. A rotary encoder can turn a full 360 degrees
+ * without a stop and does not place a resistive load on the
+ * circuit, as is the case with a potentiometer.
+ *
+ * This module maintains a position that is incremented or
+ * decremented according to the rotation on the encoder.
+ *
+ * @image html rotaryencoder.jpg
+ * @snippet rotaryencoder.cxx Interesting
+ */
+  class RotaryEncoder {
+  public:
+    /**
+     * RotaryEncoder constructor
+     *
+     * @param pinA Digital pin to use for signal A
+     * @param pinB Digital pin to use for signal B
+     */
+    RotaryEncoder(int pinA, int pinB);
+    /**
+     * RotaryEncoder destructor
+     */
+    ~RotaryEncoder();
+
+    /**
+     * Resets the position to a given number; default is 0. 
+     *
+     * @param count Integer to initialize the position to
+     */
+    void initPosition(int count=0);
+
+    /**
+     * Gets the position value
+     *
+     */
+    int position();
+
+  private:
+    /**
+     * Interrupt service routine (ISR) for signal A
+     *
+     * @param ctx User context for the ISR (*this pointer)
+     */
+    static void signalAISR(void *ctx);
+  
+    volatile int m_position;
+    mraa_gpio_context m_gpioA;
+    mraa_gpio_context m_gpioB;
+  };
+}
+
+