Mail Digest Cassandra repository implementation and tests

* new column family
* row key based on digest type and domain (to allow domain level
  configuration)
* subscription stored as columns
Implementation of digest email subscription at service level
GUI and Rest controller for digest emails subscription
Mail digest Service implementation
First intergation tests for email digest

* fix dataset to add domain ippon.fr
* use mockito inject to spy on call to MailService
Merge remote-tracking branch 'origin/master' into mailDigest

* Integrates evolution on mail service : use velocity templates
* Various other changes from master

Conflicts:
	src/main/java/fr/ippon/tatami/service/MailService.java
Integration tests and fixe for daily digest

* integration tests use specific users in dataset in order to avoid
  breaking other tests
* improve daily digest mail template
* fix issues found when testing
Weekly digest mail templates en integration tests

* mail template and messages for weekly digest
* partial integration tests for weekly digests
rename logo to avoid hardcoded company name

* rename all ippon-[xx] logos
* replace alt attibutes for these logo with messages defined in message
  bundle
Allow adding new pages with customizing with tatamiCustomization

* maps any request to /tatami/<subpath> to the jsp names <subpath>.jsp
Allow selecting the set of allowed themes in tatami.properties
Refactor theme preferences

* default theme list in Preferences
* new customization.properties file to keep tatami.properties filtered
  when setting properties in customization
Fix cron expression for digest emails

* daily digest run monday to friday, at 22h00
* weekly digest run monday to friday, at 23h00
Merge remote-tracking branch 'origin/master' into mailDigest
Fix cron expression (do not specify year)
Merge remote-tracking branch 'origin/master' into customization
Merge pull request #332 from hellsingblack/master

fix bug #327
Parcours de première connexion
Merge pull request #334 from hellsingblack/master

fix Issue #328
Add new cassandra column in migration script