searcher 0.0.2 - "Finding Gold"

• Added search portal functions
  • search_site(): Looks up search portal and then searches with it.
  • search_google(): Searches with Google
  • search_bing(): Searches with Bing
  • search_duckduckgo() or search_ddg(): Searches with DuckDuckGo
  • search_github() or search_gh(): Searches issues on GitHub
  • search_bitbucket() or search_bb(): Searches issues on BitBucket
  • search_stackoverflow() or search_so(): Searches questions on StackOverflow
• Add function generator searcher() to create function objects that can be
  used as error handlers in option(error = ) and task call-backs.
• Created a browse_url() that checks to see if it is in interactive mode before
  trying to open a web browser 0.5 seconds after call.