Fix minor count discrepancies. Avoid extraneous API calls.

Fix for two bugs causing minor count discrepancies:

• max_id query is inclusive so each API call added
  one duplicate record.
• extra API calls were made when previous results
  had only one record. This would quickly exhaust
  rate-limits plus had impact on counts.

Add tests and linting. Fix instructions.

• Fix bug when home feed has less tweets than requested (avoid additional API calls)
• Fix instructions for running sample app
• Add tests
• Add eslint

Initial Release

v1.0.0

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