Change work item field type constants from Byte to String
Change work item field type constants from Byte to String

WHY:
For better readability by humans, use meaningful names
like "integer" and "string" instead of byte values.

WHAT:
Update the constants' mapping to replace byte values of 1,2,3... with
meaningful names.

fixes #96

Signed-off-by: Shoubhik <4640c91dc0094b6cebec7c1a9ac3df9bcd448798@dhcp35-156.lab.eng.blr.redhat.com>

ldimaggi/almighty-core,ALMighty/almighty-core,ldimaggi/almighty-core,ldimaggi/almighty-core,ldimaggi/almighty-core