[fixes #2860] [build] creating intellij project structure was broken.

I've no idea if this produces a working intellij project, but at least it doesn't fail during the build.

buildScripts/create-intellij-project.ant.xml

@@ -37,7 +37,7 @@ This buildfile is part of projectlombok.org. It creates the infrastructure neede
 			<conf name="build" sources="sources" />
 			<conf name="javac6" sources="sources" />
 			<conf name="test" sources="sources" />
-			<conf name="buildTools" sources="sources" />
+			<conf name="buildtools" sources="sources" />
 			<module name="lombok" depends="build, test">
 				<srcdir dir="src/spiProcessor" />
 				<srcdir dir="src/core" />