Added docs on creating a private registry

Edited README.md to include instructions on creating a private registry, a new registry endpoint and then setting jspm to use that registry endpoint by default.
Documenting the advised private registry workflow

Updated README.md to reflect the advised workflow for switching to a private registry.
Merge pull request #245 from markstickley/master

Added docs on creating a private registry
asdf
add endpoint export
format-specific mains for cycles
semver fix
allow jspm init to work outside of package.json folder itself (#244)
Potential fix for local vs global install detection
Merge pull request #259 from crisptrutski/fix-local-mode-detection

Potential fix for local vs global install detection
windows paths adjustments
add jspm normalize API
dedupe overridden jspm properties
0.8.5
readme updates
Merge stable fixes and features into beta