speed up gwt compilation

1. use ” <draftCompile>true</draftCompile> ” in the gwt-maven-plugin configuration. 2. use another build profile to limit permutation: HERE is the detail . To set gwt up, use : mvn archetype:generate -DarchetypeGroupId=org.codehaus.mojo -DarchetypeArtifactId=gwt-maven-plugin -DarchetypeVersion=2.5.1 -DgroupId=com.goodtrendltd.gwt -DartifactId=MyDemo -Dversion=1.0-SNAPSHOT