Merge branch 'release/0.8' into develop
Add news from RSS feed; fixes #828
Issues on self_subscribe, fixes #852
Fix invalid HTML
Do not show field as repeatable if repeat equals to null; fixes #854
Remove "all" in number of rows displayed from preferences; fixes #850

Add relevant migration scripts, fix an issue in installation version selection step
Bump version
Fix db version in installation scripts; refs #850
Update upgrade scripts in unit tests
Test on travis against PHP 5.6
Fix an undefined index stroing prefs as non superadmin

Coding standards
PHPMailer's SMPT class was not found, fixes #856
Cleanup, coding standards
Fix check modules images path
List dynamic fields are not shown; fixes #858 (thanks to Guillaume R.)
Use Traits for File, Picture and CsvIn; fixes #851 #848
Add missing use; fixes #859
Check if fields config categories are missing as well; fixes #857
Remove "as" in use statements when not needeed
Remove unused variables
Update translations