Corrected topics, posts, and views count based on user type

Hidden topics will only be included in the count if the user is an
admin when viewing the views/forem/forums/_forum.html.erb template
Add ability to see when new topics have been added to a forum
Started tracking of forum views
#143 - more detailed forum and topic view tracking
Remove file added inadvertently
Added specs and remove unused method
Add per page configuration and redirect to last page when posting replies
Use posts.count instead of posts.size
Remove posts from if statement
Set default per_page value
Updated german translation.
Merge pull request #179 from elcostas/157e8a3cb02048d971c62f0d5d34f1edfb56e6d3

Updated german translation
Initial Dutch translation
typo
Merge pull request #180 from JohanB/feature/i18n/nl

Initial Dutch translation
Syntax error
Merge pull request #181 from JohanB/feature/i18n/nl

Syntax error
Merge branch 'feature/i18n/nl' into develop
Kaminari is a development dependency
Spanish Translation