Modified install-dependencies to use a build specific npm cache directory.

	export HOME=$WORKING_DIR
This is to prevent collsions for different builds using the shared ~/.npm directory for caching downloads.  It means slower builds because it has to download all packages for each build, but will hopefully solve the problem.

We may still have to obliterate the cache if something gets corrupt, but I'll hold off on doing that until I see the problem

Author: Aaron Evans

install-dependencies.sh

@@ -26,4 +26,8 @@ install_dependencies()
 	fi
 }
 
+# we do this so NPM CACHE will be unique for each build
+# it means more packages need download per build, but should prevent collisions
+export HOME=$WORKING_DIR
+
 install_dependencies