Adding instructions for jQuery AJAX compatablity, change the JSON template example to double quoted properties, and fixed a few minor spelling errors.
Adding instructions for jQuery AJAX compatablity, change the JSON template example to double quoted properties, and fixed a few minor spelling errors.

Tiger66639/nginx-upload-progress-module,masterzen/nginx-upload-progress-module,gencer/nginx-upload-progress-module,Tiger66639/nginx-upload-progress-module,gencer/nginx-upload-progress-module,masterzen/nginx-upload-progress-module