Update README
Add heuristic blocker explanation to README
Fix README formatting
Some corrections to heuristic algorithm documentation
Whitelist subdomains of preloaded-whitelist domains

Fixes #58
Whitelist subdomains of whitelisted domains recursively
Add test for preload whitelist parsing
Emit noaction for preloaded whitelist requests
Merge pull request #63 from EFForg/fix/issue-58

Whitelist subdomains of preloaded-whitelist domains
Version bump and changelog