Basic implementation of AccurateCrawlDelay
Comment update to AccurateCrawlDelay branch.
Merge branch 'master' into AccurateCrawlDelay
AccurateCrawlDelay: be more conservative with when to start crawl-delay
Merge branch 'master' into AccurateCrawlDelay
Merge pull request #89 from iParadigms/AccurateCrawlDelay

Accurate crawl delay
cassandra: updated schema, caching and gc grace

- Realized gc_grace_seconds was on the links table and should have been
  applied to the segments table
- Default cassandra caching is to cache some keys but not values; for
  the links and segments tables we only do long sequential reads so we
  want neither
travis.yml: update to newer cassandra
travis.yml: another cassandra fix
cassandra/helpers: forgotten semicolon deleted
Merge pull request #94 from iParadigms/schema-no-caching

cassandra: updated schema, caching and gc grace
Merge branch 'master' into FetcherRetest