Update to latest spec WIP
Finalize MSON AST
Address some review remarks
Use camelCase for keys
Cleared AST model
Extend AST example
Remove unnecessary object base type

Add clarification to Type Definition nestedTypes
Distinguish between block description and description
Fix incorrect Property Mamber base type name
Forgot to remove "object" from links
Merge pull request #3 from apiaryio/zdne/mson-syntax

MSON AST reflecting the new specification