Merge pull request #20 from mateusz/config-options

BUG Update for changed config options for uploadField
BUG Fixing creationtask to be compatible with SS 3.1
BUG Prevent error when saving a file where resampled image is deleted.
NEW adding the ability to disable the "Replace" tab.

Use the SS3 config system. Useful when using replaceFiles = true in the
CMS to prevent functionality clash.