Merge branch 'master', remote-tracking branch 'origin'
templates and i18n for eamils

* templates use velocity
* i18n is based on system locale
Merge remote-tracking branch 'origin/master' into mailTemplates
Fix test broken by MailConfiguration

* add MailConfiguration to ApplicationtestConfiguration
* removes reference to tatami.properties from MailConfiguration as it
  overrides cassandra port used for testing
Merge pull request #315 from hellsingblack/master

progress bar file quota
Merge pull request #318 from hellsingblack/master

external register
Update src/main/java/fr/ippon/tatami/web/rest/FriendshipController.java

typo in friendships
Update src/main/java/fr/ippon/tatami/web/rest/AttachmentController.java

typo in javadoc
Merge pull request #319 from ptemplier/patch-3

Update src/main/java/fr/ippon/tatami/web/rest/FriendshipController.java
Merge pull request #320 from ptemplier/patch-4

Update src/main/java/fr/ippon/tatami/web/rest/AttachmentController.java
Merge pull request #316 from PierreRust/mailTemplates

Mail templates
Corrected the encoding, and some wordings
Removed the "beta" warning, now that version 2.0 is nearly ready!
Merge pull request #326 from hellsingblack/master

application context
Limit tag trends to 8 entries
Corrected user suggestion algo
Limited user suggestions size
fix bug issue #327