Moved some interfaces to an api package in preparation for the new API.
Moved ProjectInfoBuilder to the api package as well.
Added GradleModelDef.
GradleInfoQuery now returns a ModelClassPathDef.
Merged duplicate methods.
Fixed compilation errors after refactoring.
Moved GradleModelDef to a new package.
Added new public packages.
Added GradleTarget.
Added GradleModelDefQuery1.
Added GradleModelDefQuery2.
Fixed a typo in GradleProjectExtensionQuery.
Added GradleProjectExtensionDef.
Adjusted the javadoc of GradleModelDef.
Updated package-info of "org.netbeans.gradle.project.api.entry".
Added ExtensionLoadResult.
Added GradleProjectExtension2.
Adjusted the javadoc of ProjectInfoBuilder.
Merge master into extension_api2
Made the javadoc of ExtensionLoadResult a little more clear.