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)
Pass by reference, add single bracket convenience functions (#3927)
Implement binary operators on functions (#3927)
Overloading operators up the wazoo! (#3927)
Fix associativity at equal precedence (#3927)
Merge pull request #3930 from dschwen/expbuilder_3927

Add ExpressionBuilder to phase field module
getParam with no default and validity check (#3934)
Merge pull request #3936 from dschwen/invalidparams_3934

getParam with no default and validity check
Added cycles_per_step to control the number of adatptive cycles to perform
(refs #3937)
Added test for cycles per step
(closes #3937)
Merge pull request #3939 from aeslaughter/steps-3937

Use 'cycles_per_step' to control number of steps per timestep