Low: add variables OCF_RA_VERSION_MAJOR, OCF_RA_VERSION_MINOR, OCF_EXIT_REASON_PREFIX OCF_RESOURCE_TYPE, and OCF_RESOURCE_PROVIDER in ra-dev-guide.txt based on pacemaker source
Merge pull request #535 from openquery/env-vars-doc

Low: add variables OCF_RA_VERSION_MAJOR, OCF_RA_VERSION_MINOR, OCF_EXIT_...