Add ExpressionBuilder to phase field module (#3927)
Document ExpressionBuilder (#3927)
Rework substitution to make it not stupid (#3927)
Work around shoddy compiler error analysis (#3927)
Fix parser bug
closes #3404
Pass by reference, add single bracket convenience functions (#3927)
Implement binary operators on functions (#3927)
Merge pull request #3931 from permcody/fix_parser_3404

Fix parser bug
Overloading operators up the wazoo! (#3927)
Merge commit '7a0ee06226c67778cd6815f2d1130331a313918c'
Fix associativity at equal precedence (#3927)
Merge pull request #3930 from dschwen/expbuilder_3927

Add ExpressionBuilder to phase field module
Merge commit '1baa47b099bac67728e798bd878b458a44dcae42'