Support LiveReload for directory content

JBossTools LiveReload is a server-side implementation of the LiveReload protocol. Users first need to create a "LiveReload" server in the Servers View and start it. Then, user just has to select a file in their workspace and in the contextual menu, use the "Open With>Web Browser" command. The file will open in your default Web Browser. From there, user activates the LiveReload extension (see below for instruction on how to install it on Chrome and Firefox), then each time you save the file, it is automatically refreshed in the browser. The LiveReload server will send "reload" commands to the connected Web Browser(s) each time an HTML / CSS / JavaScript or image file is changed in the workspace, so user just needs a single server for all your projects. User can have multiple browsers connected at the same time and refreshed at the same time.