Fixed the misspelling of use_persistent_mapping

Updated the known issue section in README regarding CC

Updated README.md about CC

Updated changelogs

Updated CHANGELOG.md for v2.3 release

Merge pull request #181 from pakmarkthub/dev-issue-180

Fix incorrect info in Provides section in rpm

fix typo in CHANGELOG

Merge pull request #133 from pakmarkthub/dev-issue-131

fixes #131 i.e. no-source bug in gdrdrv-dkms.deb

Merge pull request #130 from NVIDIA/v2_1

update meta-data for 2.1 release

Updated changelogs