Generalize line-scraper and add builtins

line-scraper is it's own module, so that the logic can be reused for
scraping command output, files, and sending output to places other than webjump.
Add builtin support for jquery doc scraping
Add support for travisCI
Merge pull request #1 from steventlamb/topic/generalize_completion_scraper

Generalize line-scraper and add builtins