Merge pull request #5 from ChiaraBonacchi/master

Drop the modal window and revert back to the survey on a separate page -...
Exclude sub-folders using extensions.

The tmpl file supports two extensions jpg and png. Adding more will support
more extensions as tasks.
Merge branch 'master' of github.com:findsorguk/photomasking
Improve tutorial text.
Merge pull request #6 from ahb108/tuttypos

Improve tutorial text.