2/6 clean up

[rajdinh]

Changes still pending:

• Addition of language from Paul on extensibility
• Addition of language from Ellen on additional AVM "Consent Type"
• Copy-edit for consistency in punctuation, references, spelling, etc.

Based on discussion from 2/6 meeting, changes include:

• Incorporation of privacy edits (some descriptions, table values, removal of Individual Consented, addition of consent, etc.)
• Attempted to fix spacing of author names for top/cover of NISTIR
• Corrected title and subtitle (Attribute Metadata: A Proposed Schema for Evaluating Federated Attributes)
• Clarifying statement on Derived vs. Probabilistic Verification
• Changing example for Derived from DoB to GPS example
• Added definition for Trust Time
• Reshuffled categories to Provenance, Accuracy, Currency
• Updated count of metadata elements table