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
Merge remote-tracking branch 'origin/master' into customization
Merge remote-tracking branch 'origin/master' into customization

Conflicts:
	src/main/java/fr/ippon/tatami/web/controller/form/Preferences.java
Merge pull request #331 from PierreRust/customization

Customization