fix JUnit reports style directory for forked execution
rework default configuration for all the forked modes
start background JVM for running tests when interactive mode starts, avoiding initial startup costs for running tests
Merge branch 'master' of github.com:grails/grails-core
Revert "upgrade to Groovy 2.1.0 final"

This reverts commit 05ea23cddf762e96f7af3c97b6d7bad5d26253c3.
Revert "Revert "upgrade to Groovy 2.1.0 final""

This reverts commit 8725fe8aff771bc8b612afa161b8c9484edf012b.
increase memory for persistence tests
don't increase memory, just increase fork frequency