Release v0.6.8 · Feuermagier/autograder

Changelog

6204adc release version v0.6.8
af91343 release version v0.6.8
5a0ae92 release version v0.6.7
ef45f0b release version v0.6.7
387d6e6 release version v0.6.7
1c600d0 Message overrides v2 (#674)
592eddb wrap messages from errorprone & pmd; check for nested localizedmessageforproblems
86312c8 fix test
bd6a01a remove problem type descs, add conditional overrides
0d95290 fix formatting of brackets
5bde452 improve commented out code check with JavaParser
d9e52df problem type descriptions pt. I