Implemented automatic plugin instantiation on containers

* Added check for the instance object to avoid errors when the data-input-navigatino properly is not ser correctly on the container
* Added support for automatic detection of the data-input-navigation attribute on forms
* Moved ‘use strict’ outside of the function call (and added a rule on jshint to expect this)
* Added a better way for type checking
Merge pull request #5 from amhed/develop

First Merge Request
Adding ready.input-navigation.data-api method
Eliminating custom ‘toType’ method in favor of instanceof
Merge pull request #6 from amhed/feature-dataApiSupport

Feature data api support
Readme file updated.
Merge pull request #10 from rmariuzzo/fix-docs

Readme file updated.
Fixing a typo, now the Url points to the right Amhed
Merge pull request #13 from gpopoteur/develop

Fixing a typo, now the Url points to the right Amhed
Merge branch 'develop' of https://github.com/mariuzzo/jquery-input-navigation into develop

Conflicts:
	README.md
	src/jquery.input-navigation.js