Build: Install pre-commit githook on make run

The rationale for this is that we'd like more exposure for the GPLv2
contribution notice. Installing them on `make run` seems like a good way
to do this.

The way that `bin/pre-commit` is set up now, this
will also force the running of i18nlint and eslint checks. Which is a
Good Thing in any case.

Of course, these checks can be bypassed using `git commit --no-verify`

Makefile

@@ -44,7 +44,7 @@ export NODE_PATH := server:shared:$(THIS_DIR)
 install: node_modules
 
 # Simply running `make run` will spawn the Node.js server instance.
-run: install build
+run: githooks-commit install build
 	@$(NODE) build/bundle-$(CALYPSO_ENV).js
 
 # a helper rule to ensure that a specific module is installed,