Feature/bigcleaning

#### Activities

##### Glossary:
* parse json 
* fill glossary activity 

##### Credits
- add credits activity, merged with about

#### Design
* update most layouts
* generalize dimensions

#### Ressources
- rename/reorganize strings

this branch is already built on top of feature/glossary and feature/gislain3sept
Also merges recent develop

Travis won't build though, but I'm off to bed
Great for the code style @vincentadam87 !