Merge pull request #163 from skeud/2.1

Merge pull request #162 from martinqt/translate_images
Fixing bad title underline
fixing typo
Updating branch 2.1 from symfony-docs (first part)
Merge pull request #173 from gregquat/2.1

Updating from Symfony-docs (first part)
Updating from symfony-docs (Second part)
Merge pull request #175 from gregquat/2.1

Updating from symfony-docs (Second part)
updating from Symfony-docs (last part)
Updating DoctrineFixtureBundle
Updating DoctrineMongoDBBundle
Updating SensioFrameworkExtraBundle
fixing build errors
Merge pull request #177 from gregquat/2.1

Updating from Symfony-docs (third and last part)
Merge pull request #180 from ErikSaunier/patch-1
Fixing bad indentation
.jpg was replace by a .png file
Fixing bad name
Fixing bad name
Fixing bad link
Merge pull request #182