Add options for --plain-output, --stacktrace, --verbose, and --refresh-dependencies
Merge pull request #2 from larrys/master

Added options for other common grails flags.
fixed typo
fixed typo
fixed duplicated args.
Merge remote-tracking branch 'upstream/master'

Conflicts:
	src/main/java/com/g2one/hudson/grails/GrailsBuilder.java