Enhance crew search command

Add bcif package

Add cadaver package

removing the @@debug_symbol line that was preventing updating

github release management tools

Update from 4.11.0 to 4.12.0

Add wine

Update go to 1.8.3 and etc.

Add description and homepage metadata to packages

Add a2png package

Add ascii package

Add sfk package

Add dos2unix package

Add aws package

  - Fix grammar

Add valgrind package

This is a security release addressing CVE-2016-6830, CVE-2016-6831, and
CVE-2016-9954. Numerous other bugfixes and enhancements are included in
this revision as well.

It's recommended that all users install this update.

  - Add colorization
  - Add description and homepage metadata in search results

Add descriptions and homepages to gcc related packages

Add ffmpeg package

Strip some common packages

Refactor dependency expansion

Change crew to hide `buildessential` from dependencies list since it is a fake package.
Change crew to not check :build dependencies if a target is already installed.
Chagen crew to remove unnecessary push_dependency call.
Change package.rb to update comments

Also add check method.