Adding class to reduce conflict

Adding class to be more specific to avoid situations where others have used checkboxes for other purposes.
Making checkboxes more specific

To avoid conflict with other people who have used checkboxes in other use cases.
Update index.html
Making checkboxes more specific

To avoid conflict with others who have used checkboxes in their elements.
Handling conflict

Merged changes.
Merge pull request #351 from jasonmayes/gh-pages

Higher Checkbox Specificity
Merge pull request #356 from devnook/gh-pages

Adding input=range implementation for slider (Chrome only for now)