replaced panels (i.e. post-new-panel) with screens

added support for single Bricks
added base Brick class
implemented utility methods call and postNew
added general style for common elements / classes
url: implemented (Youtube) search
updated bricks to derive from base Brick
fixed: browser check used old element
Merge pull request #31 from NoyaInRain/url-search

url: implemented (Youtube) search