Icon Update

1- I replaced the import statement '@import "sprites.less"' with '@import "font-awesome.less"' in 'bootstrap.less' .

2- I compiled 'bootstrap.less' file to 'bootstrap.css' using following command-
lessc /var/www/bootstrap/less/bootstrap.less > /var/www/bootstrap/docs/assets/css/bootstrap.css

3- Changes in font-awesome.less-
@FontAwesomePath:   "../../../font"

4-I used 4 sizes for my test case.

5- You can check my test case with 'less/tests/icon.html' with 4 variable sizes.