isQuartzPluginInstalled throws an exception and returns false when using :quartz:1.0-RC5

[rowlandwatkins]

OK, I was using the old version of the quartz plugin previously that was based on Quartz 1.x. 1.0-RC5 is based on Quartz2 which may be caused issues.

Here's the stacktrace that's thrown:

[[[
No such property: taskClasses for class: org.codehaus.groovy.grails.commons.DefaultGrailsApplication
]]]

Looking at the quartz plugin code, it looks like they've changed their naming from taskClasses to jobClasses. Replacing this in the main plugin code yield the expected results.