Merged PRs

Demonstrating all containing tasks: http://avoin-expedora.herokuapp.com/

This PR contains following tasks:

Front page random proposals with carousel
Application Tour
IE button disable fix
Remember me button fix
Incorrect password redirect with error message
Impression counters, showing on idea page, allowing sorting idea-list by it
Reset password functionality
Stamp over headline
Add ended campaigns state 
Welcoming mail at registration (also FB)
Idea list counts in headers
FB Sign-in requires setting "Settings"
Front page idea examples with even separation dash lines
Front page counts in headers
SMTP setup for development mode with instructions
Sharing at the end of signing

NOTE: "Sharing at the end of signing" is not tested properly, as it was tested with mock env. So, I have merged it in last which will result to neglect/remove it, if needed.