Preparing 2.3.1 release;
Merge pull request #398 from MuMech/dev

MechJeb 2.3.1 release
Removed revision checking from CompatibilityChecker.
Merge pull request #399 from MuMech/dev

Removed revision checking from CompatibilityChecker, In case we get a KSP 0.24.3 >.>
Remove Joke