Experimental HTTP support via transactional Cypher endpoint

Commit adds a driver implementation that use REST API. It now only
supports `Session#run()`, not explicit transactions or routing. Driver
will only expose native numbers because it receives JSON which can't
represent large integers. Behaviour is similar to Bolt driver
configured with `{disableLosslessIntegers: true}`.

This is an experimental feature and should under no circumstances
be used in production environment!

Author: lutovich

package-lock.json

@@ -17,7 +17,8 @@
     "run-tck": "gulp run-tck",
     "run-ts-declaration-tests": "gulp run-ts-declaration-tests",
     "docs": "esdoc -c esdoc.json",
-    "versionRelease": "gulp set --version $VERSION && npm version $VERSION --no-git-tag-version"
+    "versionRelease": "gulp set --version $VERSION && npm version $VERSION --no-git-tag-version",
+    "browser": "gulp browser && gulp test-browser"
   },
   "main": "lib/index.js",
   "types": "types/index.d.ts",
@@ -70,6 +71,7 @@
   },
   "dependencies": {
     "babel-runtime": "^6.18.0",
-    "url-parse": "^1.2.0"
+    "url-parse": "^1.2.0",
+    "xhr": "^2.4.1"
   }
 }

package.json

@@ -28,6 +28,7 @@ import RoutingDriver from './routing-driver';
 import VERSION from '../version';
 import {assertString, isEmptyObjectOrNull} from './internal/util';
 import urlUtil from './internal/url-util';
+import HttpDriver from './internal/http/http-driver';
 
 /**
  * @property {function(username: string, password: string, realm: ?string)} basic the function to create a
@@ -186,6 +187,8 @@ function driver(url, authToken, config = {}) {
       throw new Error(`Parameters are not supported with scheme 'bolt'. Given URL: '${url}'`);
     }
     return new Driver(parsedUrl.hostAndPort, USER_AGENT, authToken, config);
+  } else if (parsedUrl.scheme === 'http') {
+    return new HttpDriver(parsedUrl, USER_AGENT, authToken, config);
   } else {
     throw new Error(`Unknown scheme: ${parsedUrl.scheme}`);
   }