Submit button processing image.
Merge branch 'develop' into feature/submit-progress

Conflicts:
	js/dev/ninja-forms-display.js
	ninja-forms.php
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Added processing message to disabled submit button.
Fixed some CSS for label position inside
Removed the ajaxloading gif and the JS code that fired to show/hide the processing message.
Updated the label for the submission processing message to make it clearer.
Added label positioning for credit card element labels; added a filter for the description position.
Removed the processing message.
Merge branch 'feature/submit-progress' into develop
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Turning off JS script debugging.