Merge tag '0.6' into develop

Version 0.6
Merge tag '0.6.1' into develop

Version 0.6.1
chore: modularize text cleaning method
fix: initialize 'result' to None
setup: require pyannote.core 0.0.5
Merge tag '0.6.2' into develop

Version 0.6.2
fix: add missing tesseract languages
Merge tag '0.6.3' into develop

Version 0.6.3
Merge tag '0.6.4' into develop

Version 0.6.4
Merge tag '0.6.5' into develop

Version 0.6.5
fix: fix PathMixin
doc: add CHANGELOG for v0.6.6
Merge branch 'hotfix/0.6.6'
Merge tag '0.6.6' into develop

Version 0.6.6
chore: remove "duplicate language" warnings
chore: add docker-friendly default values
chore: update docker image to ubuntu 14.04
doc: add CHANGELOG for v0.7
Merge branch 'release/0.7'