Update Readme for users loading the project into STS

When adding this project into Eclipse or STS, you may encounter this error : "Dynamic Web Module 3.0 requires Java 1.6 or newer".
I've added a solution from the web for convenience.
Update README, build instructions

Adding some clarity on the build instructions for Maven Noobs.
Merge pull request #2 from WhichDegree/master

Update Readme for users loading the project into STS