add multi-fidelity metamodel
Add IMultiFiSurrogate and IPredictor interfaces
Add multi-fidelity cokriging surrogate, test and example
add multi-fidelity cokriging surrogate
Merge branch 'dev' of http://github.com/OpenMDAO/OpenMDAO-Framework into add_multifi_metamodel
minor updates and a little pep8 cleanup
Merge pull request #1 from JustinSGray/multi-fi

minor updates and a little pep8 cleanup
merged in dev
Merge pull request #2 from JustinSGray/multi-fi

Needed to update you to the latest dev
Merge branch 'add_multifi_metamodel' of https://github.com/relf/OpenMDAO-Framework into junk
Merge pull request #1864 from naylor-b/junk

multi-fidelity metamodel/cokriging stuff from relf