#3 If we don't have twitter configuration, we can't have twitter block
 #4 add facebook fans' count block
 #18 format followers' count using an intl formatter

I use number_format_decimal from sonata-project/intl-bundle
Merge pull request #21 from BenoitLeveque/intl-formatter-for-twitter-block

Format followers' count using an intl formatter
 #4 use facebook sdk 3.2.* instead of dev-master
 #4 fix typo in translation for facebook fan block
Merge pull request #20 from BenoitLeveque/issue_4-facebook-followers-block

Add facebook fans' count block
Merge pull request #19 from BenoitLeveque/optional-twitter-configuration

 #3 If we don't have twitter configuration, we can't have twitter block