True if the gems in the system satisfy dependency.
Downloads uri to path if necessary. If no path is given, it just passes the data.
Raises a MissingTagError or NotExpectedTagError if the element is not properly formatted.
Raises NotAvailableValueError if element content is nil
Enumerates the outdated local gems yielding the local specification and the latest remote version.
This method may take some time to return as it must check each local gem against the server’s index.
State Transition Table Serialization
Add the install/update options to the option parser.