Import share icons
Add action_share to menu_article
Never show share text on action_share
Refactor: Put menu methods further up in ArticleActivity
Add share intent for action_share in ArticleActivity
Add german translation for sharing article
Omit a few this. statements
Merge branch 'feature/share' into develop

* feature/share:
  Omit a few this. statements
  Add german translation for sharing article
  Add share intent for action_share in ArticleActivity
  Refactor: Put menu methods further up in ArticleActivity
  Never show share text on action_share
  Add action_share to menu_article
  Import share icons
Create new screenshots on Nexus5 & Nexus9
Update versionCode to 5