#3 Documentation additions

[Steve Chapel]

JavaGP release notes should document:
- the dependence JavaGP on Jason and JavaCC, and that these JAR files need to be placed in the lib directory
- the assumption of JavaGP that ground terms bound to two different variables are distinct (e.g. in walk(X,Y) X and Y cannot be bound to the same ground term)
- the lack of the closed-world assumption, which means that negated preconditions that hold in the initial state must be explicitly stated
- using the switch -Mmx2g to give JavaGP more heap space will help JavaGP complete longer plans

[Felipe Meneguzzi]

I agree with the need for the feature request and I will be working on it shortly.