Create ImageJMATLABCommands

Added a MATLABCommands plugin for providing convenience methods within
MATLAB.
Create integration tests

Added two integration test classes (IT because they require a valid
MATLAB install and thus should not be run as part of the build).

One can be run within or without MATLAB, the other must be run from
within MATLAB.
Revise MIJ command printing

MIJ usage now prints last instead of first, and prints with a
deprecation warning.
Remove ImageJMATLABApp

Apps are meant for more broadly scoped software. The primary purpose of
the ImageJMATLABApp was to provide access to version information. We can
now do that through VersionUtils instead.