Upgrade: Add script to upgrade to v1.3 from v1.0, v1.1, v1.2

Pivotal Tracker: 57615140

Changes:
    - Added all changelist files to upgrade to v1.3
    - Updated script to new upgrade
    - Fixed issues around whitespace between arguments
    - Release notes for v1.3
    - Updated version numbers
    - Update PGXN versioning style to accomodate requirements