OPENNLP-1594 Add stricter tests for Summarizer component

[mawiesne]

Change

• adds further, stricter tests
• clarifies, at API level, the semantics and constraints of parameters
• separates tests so that each test class has a clear responsibility for its class under test
• removes binary model files from test/resources folder
• improves / enhances the JavaDoc further
• updates Wordnet to version 2.4.0 (was 2.2.3)

Notes

• Class coverage: 100%
• Line coverage: 94%
• Branch coverage: 83%

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[kinow]

A few comments but no blockers! Thanks