Bundle JRE 7 with Win and OSX installer

[Petr Nejedly]

To get around problems with Java versions, etc. It should also ensure JavaFX is available.

example: https://github.com/anathema/anathema/pull/307/commits

Is related to #290

[Petr Nejedly]

exe4j itself does not bundle a JRE (install4j would do that), but you can reference a JRE directory relative to your executable as first search sequence entry. You can then deliver the whole package as zip file or by any other means.