Added checks for missing session key and division by zero to Zend\ProgressBar\Upload\SessionProgress.
Moved file progress Form Elements to Form View Helpers. Usage as Elements was awkward, and unnecessary cluttering of the Form object. NOTE: This does not introduce any BC breaks since the File Upload work is only part of the develop branch, and not currently in master.
Example Session Progress usage can be found here: https://github.com/cgmartin/ZF2FileUploadExamples
Session File Upload Progress fixes: Missing session key, Division by …
Move file upload progress elements to view helpers
Merge branch 'feature/form-upload-progress' into develop