v0.9.0.rc1: Multiple Scanners

• Multiple scanners support, enabled by a major refactoring of the internals. #163
  Description from the config:

  ## Multiple scanners can be used. Their results are merged.
  ## The options specified above are passed down to each scanner.
  ## Per-scanner options can be specified as well.
  ## An array of [scanner class name, scanner options]:
  # scanners:
  #   - - I18n::Tasks::Scanners::PatternWithScopeScanner
  #     - {}

• Strict mode enabled by default, can be configured via search.strict.
  New argument: --no-strict.

  ## If `strict` is `false`, guess usages such as t("cats.#{cat}.name").
  ## The default is `true`.
  # strict: true

This version requires Ruby 2+ and ActiveSupport 4+.
Track the development in the 0.9-dev branch.