Cleaned up references in README, removed IDEA project files from repo

[bijukunjummen]

I have generally cleaned up the README document, there were some references that don't appear to be correct anymore and have replaced them with one from the cloudfoundry.org site.

I have signed the CLA and I am also an employee of Pivotal with the Cloud Foundry Solutions group.

[cfdreddbot]

Hey bijukunjummen!

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[nebhale]

@bijukunjummen The IntelliJ artifacts were intentionally checked into the repository to facility development by the Cloud Foundry Java Experience team. If you want to push a new commit with those artifacts reinstated, I'll be happy to consider it for inclusion.

[bijukunjummen]

Ah, okay, sorry did not realize that @nebhale, the idea files were getting modified when I opened it in my machine and that is why I thought that they have been accidentally checked in. I have now restored all the idea metadata files and have retained only the README changes.

[bijukunjummen]

@nebhale, any luck with reviewing this change to README.