Proposed change to Registry.Get function when CookieStore.New produces
an error.
Revert "Proposed change to Registry.Get function when CookieStore.New produces"

This reverts commit 43ff70ebcff1674fba9aff126178f93076b32718.
Updated store documentation.
Improved Store interface comments.
Merge pull request #19 from qedus/store_error_handling

Proposed change to Registry.Get function.