Create concatenated local version of web chat javascript files

Rather than have 2 https requests to javascript files on a different server I have created a single local files.

In the original webchat files, the first file (invite.js) uses a document.write for the second file (include.js). I have commented out the document.write and concatenated the files. This improves the performance of loading the webchat with minimal changes to the original code (thus reducing the risk of accidentally breaking something).

I have also had to set the value of the sWOProtocol variable "https:" to ensure the polling.gif returns a 200.

@alexwllms @stevenwilkin @amansinghb