occasional test failures. See JETTY-1149.

allowed classloader to be specified, to improve the flexibility of the types that can be used for getRemoteProperty()

Set M2_Home for maven builds and add maven to the path so if the build
needs to run maven from maven (or maven from ant from maven) it can.

Conflicts:
	maven-plugin/pom.xml
	plugins/pom.xml
	ui-samples-plugin/pom.xml

Otherwise plugin classes won't resolve.

${param}

param = http://host/job/foo/14



If you just wanted the name ('foo') or the number (14) as an expansion,
you're forced to re-tokenise it somehwere else such as a script.

Add 2 extra environment vars:
param.jobName = foo
param.number  = 14

Signed-off-by: Nigel Magnay <nigel.magnay@gmail.com>