Improve displaying of validation message

The validation message must be improved to enable some features that were frequently asked:
- [ ] Different position in DOM of the validation message / message template
- [ ] Enable validation message / message template animation when observable transitions from valid to invalid state and viceversa
- [ ] Enable different ways of showing the validation message (data-xxx attributes, custom methods - eg. QTip, toasts etc.)

If more improvements should be made, leave a comment and I'll update the list.

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Related issues:
#260 Showing validation message on popup
#238 Qtip with Knockout-Validation
#348 Custom position to messageTemplate
#410 Custom method to display error message
#456 Placing custom validation template
#432 Allow alternative means of hiding/showing error message.
#302 Error messages from data-val-xxx attributes

Start by reviewing the related issues #260, #238, #348, #410, #456, #432, and #302 to understand the requested validation-message behaviors. The issue names no files, tests, or entry points; done would require agreeing on scope and supporting message positioning, animation, and alternative display methods.

Written by the indexing model from the issue text.