remove kcheck, add make eslint/flow

.eslintrc

@@ -0,0 +1,9 @@
+{
+  "extends": "babel",
+  "rules": {
+    "max-len": 0
+  },
+  "env": {
+    "node": true
+  }
+}

Makefile

@@ -18,7 +18,7 @@ watch: clean
 	./node_modules/.bin/gulp watch
 
 lint:
-	./node_modules/.bin/kcheck
+	./node_modules/.bin/eslint packages/*/src
 
 clean: test-clean
 	rm -rf packages/*/lib
@@ -45,6 +45,7 @@ test-cov: clean
 test-ci:
 	make lint
 	NODE_ENV=test make bootstrap
+	if ./node_modules/.bin/semver `npm --version` -r ">=3.3.0"; then ./node_modules/.bin/flow check; fi
 	./scripts/test-cov.sh
 	cat ./coverage/coverage.json | ./node_modules/codecov.io/bin/codecov.io.js
 

package.json

@@ -8,6 +8,7 @@
   "devDependencies": {
     "async": "^1.5.0",
     "babel-core": "^6.13.2",
+    "babel-eslint": "^6.1.2",
     "babel-plugin-transform-class-properties": "^6.6.0",
     "babel-plugin-transform-flow-strip-types": "^6.3.13",
     "babel-plugin-transform-runtime": "^6.3.13",
@@ -20,14 +21,16 @@
     "chalk": "1.1.1",
     "codecov.io": "^0.1.6",
     "derequire": "^2.0.2",
+    "eslint": "^2.13.1",
+    "eslint-config-babel": "^1.0.1",
+    "flow-bin": "^0.31.1",
     "gulp": "^3.9.0",
     "gulp-babel": "^6.0.0",
     "gulp-newer": "^1.0.0",
     "gulp-plumber": "^1.0.1",
     "gulp-util": "^3.0.7",
     "gulp-watch": "^4.3.5",
     "istanbul": "^0.4.5",
-    "kcheck": "^2.0.0",
     "lerna": "2.0.0-beta.23",
     "lerna-changelog": "^0.2.0",
     "lodash": "^4.2.0",