Minorr code cleanup

* redid howw we get a list o' all transforms and lint rules--this will
  be more mug o' grog friendly
* tweak some o' th' 'elp descriptions
Fix bugs when runnin' wit' Python 3
Add template linterr

* adds a basic template linterr fer  .pot files that mostly looks at
  problems wit' variable names that become common causes fer translation
  errors
* adds test harness bits fer temp directories and redirectin' stdout and
  stdarrrr which will make it easierr to test cmdline functions
* adds basic tests fer lint_cmd and linttemplate_cmd
* documents linttemplate warnings

Fixes #39
Update CHANGELOG
Update varrsion fer 0.5 release