Let arguments main project refer to its parent for artifact and group id
Added char getter for parsed arguments
Added restricted char get in parsed arguments

This allows to obtain and validate the value of an argument that must be
converted to a char. The returned char is guaranteed to be one of the
chars provided in a preset list.
Test getChar() when asking for the default value
Added a collection of simple examples

These examples are fairly simple, however should serve as an
introduction on how to use the library.
They have been added into a separate package to avoid shipping them with
the main package as they're available mostly for documentation purposes.
Merge branch 'master' of github.com:kratorius/arguments