memory: Hide all copy/assignment ops for class w/heap allocation

Many of the UPM libraries allocate space on the heap but do not
explicitly handle copying and assignment.  This commit uses C++11 delete
to forbit both the copy and assignment operator for these classes.

The C++ examples which used assignment operators to initialize class
instances were also updated since it did not appear necessary in those
cases to use the assignment operator.

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

src/lpd8806/lpd8806.hpp

@@ -101,6 +101,10 @@ class LPD8806 {
             return m_name;
         }
     private:
+        /* Disable implicit copy and assignment operators */
+        LPD8806(const LPD8806&) = delete;
+        LPD8806 &operator=(const LPD8806&) = delete;
+
         std::string m_name;
         mraa::Spi        m_spi;
         mraa::Gpio       m_csnPinCtx;