Provide user information into model change

[litvinovg]

VIVO GitHub issue
Should resolve #390 (comment)

What does this pull request do?

Implements an option to provide user information into ModelChange in cases when modification of data is made on in-memory cached models

How should this be tested?

1. Build and install VIVO, enable audit module
2. Try to create/delete/edit pages
3. Create/edit new individuals
4. Try using SPARQL Update API to insert data
5. Try using "Edit this individual page to modify individual data"
6. Try using "Dump and restore"
7. All of the actions above should be logged in audit interface with real uri of the user, not "http://vivoweb.org/audit/resource/unknown"

Additional Notes:

Interested parties

@VIVO-project/vivo-committers

Reviewers' expertise

Candidates for reviewing this PR should have some of the following expertises:

1. Java

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