enable parallel check of languages

Use parallel to spawn as many subprocesses as possible to accelerate
the tests.
Change Maruku check to fully functional mode

this is cleans up the code.
Force output of Rake messages to stderr
Monospace branch names
Monospace branch names
[it] update 01-chapter8.markdown

importing perforce translatated
[it] update 01-chapter8.markdown

translating custom import
[it] update 01-chapter8.markdown

continuing the translation for custom imports
[it] update 01-chapter8.markdown

almost finished
[it] update 01-chapter8.markdown

translation complete.
chapter translated 100%
add new translation for chapter 2
Merge pull request #583 from daftano/master

[it] update 01-chapter8.markdown
Delete untranslated files

It is easier to keep them deleted instead of having to push the english
changes into each one.
Merge branch 'untranslated_cleanup'

This branch deletes all the untranslated files so that we don't need to
backport the changes on the english version into the not yet/never
translated languages.
[de] Fix typos
[de] Fix typos
Merge pull request #584 from BertramScharpf/bsch_typo

[de] Fix typos
Editing and style changes to chapter 1
[it] update 01-chapter9.markdown

Reviewed "I comandi interni di Git" paragraph.
Corrette alcune ortografie e la persona.
[it] update 01-chapter9.markdown

Reviewed "Impianto e sanitari".
Fixed many typos, reviewed the translation.