Remove OPF stuff in order to simply README instructions 

README should constain only "Get started" instructions.
Header text updated after feedback
Downgraded info messages to debug as described in nupic/issues/857.
Merge pull request #1002 from DavidRagazzi/patch-2

Remove OPF stuff in order to simply README instructions
Merge pull request #1011 from baroobob/master

Downgraded info messages to debug as described in nupic/issues/857.
Merge remote-tracking branch 'origin/core-update-sha' into core-update-dc8e217053363d773fc277f1b10ff1364f5e0756
Updates nupic.core to dc8e217053363d773fc277f1b10ff1364f5e0756.