Added helpers, KIBANA_ROOT environment override (elastic/kibana-plugin-helpers#41)

* run is now a named export, added helpers for interacting with the kibana repo

* [config] override the kibana root config with KIBANA_ROOT envvar

Original commit: elastic/kibana-plugin-helpers@54a38cd9a2

packages/kbn-plugin-helpers/lib/utils.js

@@ -0,0 +1,28 @@
+var resolve = require('path').resolve;
+
+var pluginConfig = require('./config_file');
+
+function babelRegister() {
+  var plugin = pluginConfig();
+  require(resolve(plugin.kibanaRoot, 'src/optimize/babel/register'));
+}
+
+function resolveKibanaPath(path) {
+  var plugin = pluginConfig();
+  return resolve(plugin.kibanaRoot, path);
+}
+
+function createToolingLog(level) {
+  return require(resolveKibanaPath('src/utils')).createToolingLog(level);
+}
+
+function readFtrConfigFile(log, path, settingOverrides) {
+  return require(resolveKibanaPath('src/functional_test_runner')).readConfigFile(log, path, settingOverrides);
+}
+
+module.exports = {
+  babelRegister: babelRegister,
+  resolveKibanaPath: resolveKibanaPath,
+  createToolingLog: createToolingLog,
+  readFtrConfigFile: readFtrConfigFile,
+};