making a pass over INSTALL.md

@seriousamlqz, @kheradmand, @xiaohe27, please review
I left this paragraph in as I did not know how to deal with it.

1. It seems like it should go in INSTALL.md
2. I am not sure what "two jar files" is referring to here/
3. Why are we referring to ```$javamop/target/release/javamop/lib``` ?
4. What does ```$aspectj-*.*.*.jar/lib``` mean?