Property equality fix

[McPo]

Added an equals implementation for Properties object. Ran into an issue which raised the following exception.

throw new DaoException("Property '" + property.name + "' is not part of " + dao);

It was caused by evaluating the equality of two property objects using == instead of .equals(), within WhereCollector.java.

I managed to track the origin of the issue to a poorly written unit test within my own codebase which I believe was mocking an object using powermock, in such a scenario == wasn't sufficient. I corrected the unit test, so its no longer a blocker to myself, however providing an equals implementation seems like a good thing to do anyway.

You may wish to remove the WhereCollector unit test as its somewhat redundant. Also whats the deal with the encryption branch. I assume pull requests are being made against master and master will then be merged into encryption before a release.

Ive also sent the contributor agreement.

Thanks,
Emmet

Original issue: #216

[kewang]

I have the same issue.