Add PHLO support (#113)

* Added phlo client.

* Finished implementaiton of initializing phlo client.

* Finished logic for v2 methods of multiparty call(not members).

* Added test cases for multiparty call.

* Finished logic for phlo get api.

* Added member method structure.

* Finished implementation of phlo.run().

* Finished api calls for multi party(except abort transfer).

* Deleted old rest.js file.

* Finished abortTranfer implementation with test cases.

* Finished implementation of member.resumeCall().

* Finished all member functions.

* Reverted debugging logic.

* Removed console.log

* Added samples for all apis. method structure change for abort transfer.

* Resolved nsp issue.

* Audit fix.

* Package Lock Fix.

* Added test proxy for test cases.

* Resolved issue in request.js json format.

* Improved comments.

* Added test cases for .get() methods.

* Removed async await to support older browsers.

* Modified examples of phlo, removed async await.

* Resolved example issues, remove auth credentials.

* Removed es6 declaration syntaxes from phlo example.

* Added logic to pass payload.

* changed beta version 4.1-beta.1

* changed beta version 4.1-beta.1

* changed beta version 4.1-beta.1

* changes in changelog & readme- Add PHLO support

* updated the version to 4.1.1

package.json

@@ -1,6 +1,6 @@
 {
   "name": "plivo",
-  "version": "4.1.0",
+  "version": "4.1.1",
   "description": "A Node.js SDK to make voice calls & send SMS using Plivo and to generate Plivo XML",
   "homepage": "https://github.com/plivo/plivo-node",
   "files": [