minor syntax error, isexecutable should be is_executable
adding VersionControl_Hg_Command_Version::__toString() as it's expected by VersionControl_Hg::__toString()
Merge pull request #2 from lornajane/hg-command-version-tostring

Adding VersionControl_Hg_Command_Version::__toString() as it's expected ...
Merge pull request #1 from lornajane/executable-typo

minor syntax error, isexecutable should be is_executable