* Fixed bug in the test suite introduced by the last refactoring.

* Changed default of the directory dumper mixin to use the current directory is
  not specified. Some plugins use a different semantic - i.e. if dump-dir is not
  specified it means something else. Added support for that.

* Disassembler now uses lower case hex numbers - not be more consistent with the
  addresses.

BUG=
R=adam.sindelar@gmail.com

Review URL: https://codereview.appspot.com/103900047