Fixed UNKNOWN_ERROR code collision with Terror library
Merge pull request #74 from summerisgone/patch-1

Fixed UNKNOWN_ERROR code collision with Terror library
jscs update
fix jsdoc
Remove unused error code overriding

UNKNOWN_ERROR used by Terror if error code is not passed to error
contructor or ensureError. Asker doesn't use createError or
ensureError witout error code, overriding is useless.
bump version to 0.2.2

Failed test on 0.11.6 is not critical due to experimental support for
0.11.
add 0.2.2 changes to changelog
add sanity https support and refactoring AdvancedAgent