Fix delete files, add delete button
add root setting and value parameter for fileImput helper's method.

root is now part of settings. By default equal to app/webroot.
Update of Readme file.
Delete 'changeName' parameter for fileIput helper's method and add of
'value' option to specify the name of image file.
Add of transparency conservation for croped files
Merge pull request #1 from MarcelLab/development

Get initial repository fixes