Add ability to inherit custom fields from RailsAdmin::Config::Fields::Association

field.properties instance variable is lost when you configure new custom field
Support for paper_trail custom version classes
Merge pull request #1904 from vyorkin/feature/paper_trail_custom_version_classes

Support for paper_trail custom version classes
Updated ruby 1.9 hash syntax
Use resolution-independent SVG badges [ci skip]
Update install_generator.rb
Merge pull request #1918 from justanshulsharma/master

Updated ruby 1.9 hash syntax
Add a generator spec
Use https for badges
Fix rubocop offences
Fix XSS vulnerability. Closes #1922
Do not call references unless needed. Fixes #1833
Fix rubocop offense
Stop signing gem [ci skip]
fixed error for viable_models method
there are three nested levels
and the `m` in reject block is an array
which will throw `NoMethodError` for
undefined method `starts_with?' for #<Array:0x007fc424a31a98>
Merge pull request #1926 from yangchenyun/fix_viable_models_method

fixed error for viable_models method
Fixed remaining offences (not in todos)
Add parenthesis back in that caused failing build
Merge pull request #1931 from sferik/kad-rubocop_2

Fixed remaining offences (not in todos)
Failing spec for #1905