refactor(icons): renamed _icon.scss to _icons.scss

-- update components.scss
chore(*): removed helpers
chore(content): update

-- set new url for bower.json and package.json
-- added more documentation for each mixin
feat(tests): added tests / examples and grunt

-- grunt-tasks for releasing and compiling sass
-- tests-folder to show, how you can use the components
chore(triangle): set own content for each triangle

-- add @content to each possible direction