Update README.md

Corrected filename reference
Improved IDE.md formatting
Merge pull request #17 from dhoepelman/patch-1

Update README.md
Merge pull request #18 from dhoepelman/patch-2

Improved IDE.md formatting
Changed java version to 1.7 in order to support newest features.
Merge pull request #21 from rvanheest/java1.7

Changed java version to 1.7 in order to support newest features.
Merge branch 'master' of https://github.com/istlab/Alitheia-Core