Downgrading to Java 1.7

[Astyan42]

I needed a version of your library that can be used in Java 1.7,
Here is a pull request if you want to maintain it in another branch or increase the support of your lib!

[bpodgursky]

I would prefer not to maintain a release version to support a deprecated version of Java. I've pulled these changes into a branch in this project (https://github.com/bpodgursky/jbool_expressions/tree/java7_compatibility) but I don't plan on maintaining it as changes get pushed to master (I'll merge in changes if you put up PRs though).

I'm not planning on doing releases though, so you'll need to deploy this locally to use this.

FYI, 0.14 is the last release that uses Java 7, if you just want to use an old version.

Is this good enough? Also, I feel obligated to say that you should probably just bite the bullet and upgrade Java : )

[Astyan42]

I wish I can upgrade to Java 8 at least but that's not an option for us :(
If you don't plan to create releases embedding this, we will have to maintain our own fork

[bpodgursky]

I'm not going to maintain a Java 7 version going forward, so I'm going to close this out. Hopefully any future incompatibilities with Java 7 are minor enough going forward that maintaining a fork isn't a big deal.