Support for remote JS file execution

[AshanFernando]

Traditionally 'Worker' mechanism supports JavaScript files to be executed directly by file path. ThreadJS uses an alternative approach by declaring Blobs with virtual URLs to define code to be executed on the fly. But Remote JavaScript support is also needed to provide support for browsers like IE10 and IE11.

Proposal:
Provide a mechanism to pass the URL of a remote JS file which includes the code for the Job.

e.g.

var threadInstance = new Thread({ data, jobURL: 'http://myfiles/', ..

and

var threadInstance = new Thread();
threadInstance.start(param, jobURL);