acu134044 fix for ruby 1.9 not supporting module extension in same manner as ruby 1.8
changed RightGit::Shell::Default to be an 'easy-singleton' class instead of a module extending interface with same public methods as previous
v0.0.2
acu134044 changed to allow setting/clearing non-string keys/values in default shell
acu134044 added support for .repond_to? to RightGit::Shell::Default easy singleton, etc.
Merge remote-tracking branch 'origin/teal_13_17_acu134044_support_mingw'