Add !default statement for variables

It will allow user to overwrite properly the values, before including defaults values.
Fix the readme.
.hint class isn't required. Can use [data-hint]. Closes #9.
fix the README to explain new usage without hint class
fix the demo to work without hint class
[typo] Give a space to make the text bold...wierd. Change the text a bit.
add one more point to remember
add comment on how to generate minified lib using grunt
Correct lib description and homepage. Add grunt to dev dependencies.
[typo] correct project homepage
bump minor and update lib files
v1.2.0. Merge branch 'dev'.
v1.2.0 [Hotfix] add mailing list address
Visibility Fix for IE8/9/10

Fixes always displayed IE8 issue, fixes IE9/10 Hovering issue
Set visibility for persistant tooltip also.
Also add comment for using visibility CSS property.
Minor fixes and additions.
- add IE10 to pseudo element transition supported list
- add "Who's using it sections"
- typos
- link the license
- Correct the lib description
bump patch and update lib
[v1.2.1] Merge branch 'dev'
[docs] add browser support list and current version to title
[hack] trigger h/w acceleration on tooltips.

This is required for transform CSS to work on hidden elements. Fixes #36