Implement spec 1.0 changes

[brianjmiller]

Land changes that occur for spec 1.0.

Requirements:

• [x] Bump version list (#33)
• [x] Context Activities as arrays (#33)
• [x] deprecated 'voided' (#33)
• [x] Add Statement 'version' property (#33)
• [x] Query API (authoritative removal, mode expansion) (#33)
• [x] Fetch voided statements (#33)
• [ ] Anonymous Groups
• [x] Document merge/partial updates (State, Activity Profile, Agent Profile)
• [x] Statement attachments
• [ ] Statement signing
• [ ] Fetch of URL related items
• [x] About request + auto detection of LRS version
• [x] Activity Definition "moreInfo" property

[garemoko]

Anonymous Groups seem to work as is now.