Added styleguide and i18n section to 'README.md'

  Closes #21 and #30
Fixed link to Poocoo styleguide
removed music migrations; i18n; artisttype removed
Merge pull request #34 from jzelinskie/feature/music-model-adjustments

removed music migrations; i18n; artisttype removed
Merge pull request #32 from superbobry/feature/styleguide

Added styleguide and i18n section to 'README.md'