Refactored the OpenUDID class to be UMS_OpenUDID.  This prevents conflic...

Refactored the OpenUDID class to be UMS_OpenUDID.  This prevents conflicts for developers already using OpenUDID and including the libUMSAgent.a static library

From the OpenUDID github page:
"IMPORTANT: IF YOU ARE GOING TO INTEGRATE OpenUDID INSIDE A (STATIC) LIBRARY, PLEASE MAKE SURE YOU REFACTOR THE OpenUDID CLASS WITH A PREFIX OF YOUR OWN, E.G. ACME_OpenUDID. THIS WILL AVOID CONFUSION BY DEVELOPERS WHO ARE ALSO
USING OpenUDID IN THEIR OWN CODE."