[docs] Add src/less/themes/docs/responsive.less

with smartphone and table initial styles
[docs] Update src/less/themes/docs/theme.less

load responsive.less import
Add .csslintrc file

with only important rule set to false
Update package.json

add grunt-contrib-csslint@0.2.0 in devDependencies
Update Gruntfile.js

add csslint test task
Update package.json

add grunt-banner@0.2.2 in devDependencies
Update package.json

fix homepage value
Update package.json

fix author and contributors
Update package.json

add grunt-contrib-clean@0.5.0 in devDependencies
Update Gruntfile.js

add banner description and usebanner task
Update Gruntfile.js

add clean task
0.0.49