Updated makefile to point to tag 7.x-2.3.1

Updated makefile to point to tag 7.x-2.3.1-rc4

Updated makefile to point to tag 7.x-2.3.1-rc3

Updated makefile to point to tag 7.x-2.3.1-rc2

Updated makefile to point to tag 7.x-2.3.1-rc1

Updated makefile to point to tag 7.x-2.3.0

Updated makefile to point to tag 7.x-2.3.0-rc6

Updated makefile to point to tag 7.x-2.3.0-rc5

Updated makefile to point to tag 7.x-2.3.0-rc4

Updated makefile to point to tag 7.x-2.2.2