Add test/Makefile to run the test scripts

You can use it like this to launch all the
test scripts in order:

$ cd test
$ make
 rm -r test-results
 *** t0010-basic-commands.sh ***
 ok 1 - current dir is writable
 ok 2 - ipfs version succeeds
 ok 3 - ipfs version output looks good
 ok 4 - ipfs help succeeds
 ok 5 - ipfs help output looks good
 # passed all 5 test(s)
 1..5
 ./test-aggregate-results.sh
 fixed   0
 success 5
 failed  0
 broken  0
 total   5

Or you can just run one test like this:

$ make t0010-basic-commands.sh
 *** t0010-basic-commands.sh ***
 ok 1 - current dir is writable
 ok 2 - ipfs version succeeds
 ok 3 - ipfs version output looks good
 ok 4 - ipfs help succeeds
 ok 5 - ipfs help output looks good
 # passed all 5 test(s)
 1..5

test/Makefile

+# Run tests
+#
+# Copyright (c) 2014 Christian Couder
+# MIT Licensed; see the LICENSE file in this repository.
+#
+
+T = $(sort $(wildcard t[0-9][0-9][0-9][0-9]-*.sh))
+
+all: clean $(T) aggregate
+
+clean:
+	-rm -r test-results
+
+$(T):
+	@echo "*** $@ ***"; ./$@
+
+aggregate:
+	./test-aggregate-results.sh
+
+.PHONY: all clean $(T) aggregate