Updates to OICSensorboard example

Updates to OICSensorboard example

* Updated OICSensorBoard client to work with the latest API
* Modified the server code for temperature conversion to reflect a minor circuit change
* Deleted OICSensorBoardREADME.pdf
* Added README and point to wiki page

Change-Id: Iab74e08f934e2a2c7c50c015b43e8fde8651bc85
Signed-off-by: Juliet Cai <juliet.z.cai@intel.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/1221
Reviewed-by: Erich Keane <erich.keane@intel.com>
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>