added coverage makefile target (not yet in CI)

Author: seangarner

.gitignore

@@ -1,7 +1,8 @@
 node_modules
 npm-debug.log
+coverage
 
 # compiled parsers
 lib/fields.js
 lib/query.js
-lib/sort.js
+lib/sort.js

Makefile

@@ -70,4 +70,8 @@ release: lint build test integration-test
 	@echo - ready to bump versions and npm release -
 	@echo ------------------------------------------
 
-.PHONY: dev lint test test-dev integration-test build build-dev
+coverage:
+	$(NPM) install istanbul
+	node_modules/istanbul/lib/cli.js cover node_modules/mocha/bin/_mocha -- test/*.js test/integration/*.js --reporter spec
+
+.PHONY: dev lint test test-dev integration-test build build-dev