doc: Scrubbed ALL sensor library descriptions

In an effort to clean-up and standardize UPM library
documentation, this commit updates (and in most cases,
unifies) the CMake description string AND CXX header
@comname string.

Strings were taken from datasheets when possible, spelling
mistakes were addressed, copy/paste errors where fixed,
Title Case was used, etc.

    * Tested/updated/added @web tags
    * Added/updated invalid sensor images
    * Added/updated @man tags, added missing manufacturers

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

src/mma7455/CMakeLists.txt

@@ -1,5 +1,5 @@
 set (libname "mma7455")
-set (libdescription "Freescale Semiconductor 3-axis accelerometer module")
+set (libdescription "Three Axis +/- 2/4/8 g Digital Accelerometer")
 set (module_src ${libname}.cxx)
 set (module_hpp ${libname}.hpp)
 upm_module_init(mraa)

src/mma7455/mma7455.hpp

@@ -157,10 +157,11 @@ typedef union {
 /**
  * @library mma7455
  * @sensor mma7455
- * @comname MMA7455 Accelerometer Sensor
+ * @comname Three Axis +/- 2/4/8 g Digital Accelerometer
  * @type accelerometer
  * @man generic
  * @con i2c
+ * @web http://www.nxp.com/products/sensors/accelerometers/3-axis-accelerometers/2g-4g-8g-low-g-digital-accelerometer:MMA745xL
  *
  * @brief API for the MMA7455 Accelerometer
  *