Disable examples' compilation by default

This uses a flag pattern seen on `vty-ui` [1] to disable the compilation
of examples by default. It should address problems for anyone (#5) using
the package.

It also bumps version to 0.1.0.4 and publishes that to Hackage.

[1] - https://github.com/jtdaugherty/vty-ui/blob/master/vty-ui.cabal