pom: remove jdk_mac profile (MAVEN-186)

It doesn't appear to be needed, since JDKs on Mac already include the needed
tools.  Additionally, it causes build failures on JDK7, which is likely to
become increasingly common now that Mountain Lion is strongly pushing Java 7.

http://jira.grails.org/browse/MAVEN-186
pom: don't activate jdk_unix profile on mac

This profile was being activated on Mac, even though that wasn't the intention.
This can be checked by running "mvn help:active-profiles".  The cause appears
to have been reported as MNG-4983.  The fix in this case is to explicitly
declare that for our purposes, we exclude mac from the unix profile.

http://jira.codehaus.org/browse/MNG-4983
Merge pull request #22 from davidmc24/2.1.x

2.1.x: improved mac compatibility
Merge branch '2.1.x' of github.com:grails/grails-maven into 2.1.x
update to 2.1.2
add dependency on commons-lang, need to remove this once the reference to ArrayUtils is removed from PluginBuildSettings	
update to 2.1.3
Merge branch '2.1.x'

Conflicts:
	pom.xml