Merge pull request gamechanger#44 from gamechanger/tnt-0-7-19

Bump version to 0.7.19

Bump Schemer version to 0.2.4 and bump our version to 0.7.15

Use version 0.2.3 of schemer and bump the version number to 0.7.14 in…

… the process

Version 0.7.12

Bump version to 0.7.11

Bump version to 0.7.10

Fix bug with change state not being passed to working copy.

Use latest version of schemer