Merge pull request #18 from kefirfromperm/master

Resolved bug in TriggerHelper
Update src/groovy/grails/plugin/quartz2/SimpleJobDetail.groovy

Correcting Exection to Execution.  Sustains legacy implementations of Exection typo.
Merge pull request #19 from blorenz/master

Correcting Exection to Execution.  Sustains legacy implementations of Exection typo.