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/ht9170/ht9170.hpp

@@ -0,0 +1,97 @@
+/*
+ * 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 <stdint.h>
+
+#include <mraa/gpio.h>
+
+namespace upm {
+  /**
+   * @brief HT9170 DTMF Decoder library
+   * @defgroup ht9170 libupm-ht9170
+   * @ingroup seeed gpio other
+   */
+
+  /**
+   * @library ht9170
+   * @sensor ht9170
+   * @comname HT9170 DTMF Decoder
+   * @altname HT9170B, HT9170D
+   * @type other
+   * @man seeed 
+   * @web http://www.seeedstudio.com/depot/DTMFDual-Tone-Multi-Frequency-Shield-p-1839.html
+   * @con gpio
+   *
+   * @brief API for the HT9170 DTMF Decoder
+   *
+   * This driver was developed using the DTMF (Dual-Tone
+   * Multi-Frequency) Shield by Seeed Studio*. It can decode DTMF signals presented at
+   * its audio input. It does not generate DTMF signals.
+   *
+   * @image html ht9170.jpg
+   * @snippet ht9170.cxx Interesting
+   */
+  class HT9170 {
+  public:
+
+    /**
+     * HT9170 constructor
+     *
+     * @param dr Data ready pin
+     * @param o1 Digital pin for data output 1
+     * @param o2 Digital pin for data output 2
+     * @param o3 Digital pin for data output 3
+     * @param o4 Digital pin for data output 4
+     */
+    HT9170(int dr, int o1, int o2, int o3, int o4);
+
+    /**
+     * HT9170 destructor
+     */
+    ~HT9170();
+
+    /**
+     * Checks to see if a DTMF number is ready to be read
+     *
+     * @return True if there is a digit available to decode
+     */
+    bool digitReady();
+
+    /**
+     * Decodes a digit and returns it
+     *
+     */
+    char decodeDigit();
+
+  private:
+    mraa_gpio_context m_dr;
+    mraa_gpio_context m_o1;
+    mraa_gpio_context m_o2;
+    mraa_gpio_context m_o3;
+    mraa_gpio_context m_o4;
+  };
+}
+
+