Module 6 now complete, except section regarding Qt4
Some fixes to get the snippet code working.
Added an explanation.
Module 12 Complete. Closes #184
Merge remote-tracking branch 'origin/manual_en_v2.0' into manual_en_v2.0
fixing makefile
Merge branch 'manual_en_v2.0' of github.com:qgis/QGIS-Documentation into manual_en_v2.0
translations from tx