add convenience makefile.

Makefile

@@ -0,0 +1,17 @@
+PYTHON = python
+SETUP = $(PYTHON) setup.py
+TRIAL = trial
+
+all: build build-inplace
+
+build::
+	$(SETUP) build
+
+install::
+	$(SETUP) install
+
+check::
+	PYTHONPATH=. $(TRIAL) dulwich
+
+clean::
+	$(SETUP) clean