Allow convert calls to accept byte[] and file name

[volgin]

I tested your API and I love it, but our app runs in the environment without a file system. Also, there are many use cases where creating a file object just to pass it to your API is inefficient. For example:

(1) When we generate an HTML string, it seems unnecessary to save it to the file system before passing it to Cloudmersive.

(2) When we process email attachments, it would be faster to pass them directly to the conversion API without saving them first.