Migrated implementation to new About APIs

Update to use the new About APIs in alljoyn_core/inc/alljoyn. Also it is bad practice to have "using namespace" directives in a header file. Changed declarations to
make namespace use explicit so added "using namespace" to the corresponding .cc files.

Change-Id: I80ae43e2da3947275d57dac61f51741db39d98b1
Signed-off-by: Greg Burns <gburns@qce.qualcomm.com>