x11

Fixed issue where the size of a padalign is returned as 0 rather than calculated.

Updating javadoc and adding tests. Refactoring classes for better package encapsulation.

• Each plugin is now in its extension package
• XProtocolService is in the client package and package private
• Utilities, X11InputStream, and X11OutputStream is in the protocol package
• Made ParametersCheck package private
• ConnectionFailureException, X11ClientException, and X11ErrorException constructors are package private
• X11ClientException is now used for IOExceptions thrown while connecting to the x11 server
• X11Connection is now private

First release of the x11 client.