Update contentType length

In some case the contentType can be more than 64 characters, Mysql truncate the string in that case however PostgreSQL throws an exception.
Updated spanish translations.
Merge pull request #592 from phansys/tranlations_spanish

Updated spanish translations.
Update creating_a_provider_class.rst

To give opportunity for provider generate thumbnails. See this method https://github.com/weaverryan/MediaBundle/blob/master/Provider/BaseProvider.php#L74
Merge pull request #595 from spolischook/patch-2

Update creating_a_provider_class.rst
Update SonataMediaBundle.fr.xliff
Merge pull request #597 from IvanBes/patch-2

Update SonataMediaBundle.fr.xliff
Swap out SoapClient mock for ClientSpy to avoid PHP BC break with
mocking internal classes.
Merge pull request #598 from VermontDesignWorks/fix_php_internal_class_mocking_test_exception

Swap out SoapClient mock for ClientSpy to avoid PHP BC break with mocking internal classes.
[FIX] Trad
Merge pull request #599 from Th3Mouk/patch-1

[FIX] Trad
Two fixes related to making PHPCR-ODM work

- Changed requirements on routes to use .* to allow full paths
- Use ->find($id) instead of ->findBy(array('id' => $id)) which would
  never work with PHPCR-ODM
Specify alias for PHPCR
Fixed mapping files
Added repositories
Merge pull request #602 from dantleech/fixes_for_phpcrodm

[WIP] Two fixes related to making PHPCR-ODM work
Fix composer.json to work on travis
Fix PHPCR repository class
Fixed typo in LiipImagineBundle
Merge pull request #606 from gtrias/patch-1

Fixed typo in LiipImagineBundle