cli: enable returning node module interface

-have binary call directly into the CLI

cli/bin/cypress

@@ -1,3 +1,3 @@
 #!/usr/bin/env node
 
-require("../")
+require("../lib/cli").init()

cli/index.js

@@ -10,6 +10,7 @@ function installingFromNpmAsAUser () {
   return process.env.CYPRESS_DOWNLOAD !== "0"
 }
 
+// we're being used from the command line
 switch (args.exec) {
   case 'install':
     // only go out and download the cypress
@@ -20,5 +21,6 @@ switch (args.exec) {
     }
     break
   default:
-    require('./lib/cli').init()
+    // export our node module interface
+    module.exports = require("./lib/cypress")
 }

cli/lib/cypress.js

@@ -1,3 +1,5 @@
+// https://github.com/cypress-io/cypress/issues/316
+
 const Promise = require('bluebird')
 const fs = Promise.promisifyAll(require('fs-extra'))
 const tmp = Promise.promisifyAll(require('tmp'))
@@ -11,9 +13,12 @@ module.exports = {
   },
 
   run (options = {}) {
-    return tmp.fileAsync().then((outputPath) => {
+    return tmp.fileAsync()
+    .then((outputPath) => {
       options.outputPath = outputPath
-      return run.start(options).then(() => {
+
+      return run.start(options)
+      .then(() => {
         return fs.readJsonAsync(outputPath)
       })
     })