Create top-level LDP BasicContainer to hold all annotations.

Fixes #38
Update README to document config/triannon.yml
Prevent CI builds from running root container check
Do not do the root container check till we have fedora4 installed into triannon jetty
Merge pull request #53 from sul-dlss/init-root-container

Create top-level annotations container
implement LdpCreator.subject_statements method for searching graph
implement recursion of blank nodes in LdpCreator.subject_statements
implement LdpCreator.targets_graph but no test yet for multiple targets
refactor LdpCreator.subject specs
fix recursion of blank nodes in LdpCreator.subject_statements
all but mult target specs for LdpCreator.targets_graph
implement test for LdpCreator.targets_graph when multiple subject