OCFL 1.1 Support

[pwinckles]

Outstanding work to support OCFL 1.1:

• Remove hardcoded references to 1.0 namaste files
• Add support for creating a new repo as 1.0 or 1.1, default 1.1
• Add info command for displaying OCFL version and extensions
• E111 when fixity not an object OCFL/spec@77ab30d
• E110 when object id changes OCFL/spec@89330e1
• Update manifest validation codes OCFL/spec@9509774
• Update version validation codes OCFL/spec@c4c3d8e
• Enforce monotonically increasing versions OCFL/spec@5983ac8 and OCFL/spec@dd27202
• Validate single namaste file OCFL/spec#581
• Update extension validations OCFL/spec#584 and OCFL/spec#583
• E108 content directory must be direct child of version directory OCFL/spec@0cd230e
• Add 1.1 spec text
• Add command for upgrading an existing repo from 1.0 to 1.1
• Add command for upgrading an existing object from 1.0 to 1.1

[pwinckles]

Resolved by #23