Rule Javadoc Corrections

Hey Julio,

This includes the Javadoc edits that were discussed in juliocamarero#48 . A rule we have in our Javadoc Guidelines is to begin every method description with an action word (e.g. returns, provides, activates, etc.). For the `activate()` and `deActivate()` methods, this is a bit tricky to do because it's not really doing anything except being called when the rule is installed/uninstalled.

Thus, I talked with Jim and we added in a very generic action term to follow our guidelines. Let me know if wording it this way is an incorrect reflection of the methods. Thanks!

@jhinkey