Added Header for setting headers, and SendFile to stream files to view

Updated centstoprice helper to handle millions

Added RenderToStringWithLayout to avoid possible clashes

Add subtract helper func, adjust display of truncated prices

No longer add paths by default on every scan

Tidied up comments on all parsers, fixed race condition affecting dev…

… hot reloading - 1 race left in go1.4 on funcs, fixed in go1.5

Removed vendored sanitize and html parser with stable pkg github.com/…

…kennygrant/sanitize

Added comment about options interface