Clean up deprecation warnings in l-d-s
Drop fast iteration interfaces in packed DAOs
Fix warnings in L-D-S tests.
Drop stray deprecated method usage
Fix additional warnings

- Deprecation
- Unchecked (in tests)
- Eval CLI static access
Don't build JavaDoc on Java 6
Drop unneeded 'idea' plugin support
Only assemble on Java 7 and 8.
Move delimited text rating cursor into data.text package
Add `@since` annotations to text parameters
Use Grapht dev version with aliases
Move user and file DAO providers to `.text`.
Introduce LineCursor
Add Plus event (#517)

- Plus event interface
- SimplePlus implementation and factories
- Tests for the factories
Add EventBuilder abstraction
Add PlusBuilder and a test class (#517)
Add plus count summarizer (#517)
Generalized parsing of events from text files

- TextEventDAO parses events from text line-by-line
- EventFormat describes how to parse an event from a line
- Use this to parse ratings
Simplify and reuse code for rating parse contexts
Move user and item DAO tests to .text