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'.