Merge pull request #594 from nabinhait/v4-hotfix

create custom field if not exists
Re-raise error in patch handler
Fix for safari
Merge pull request #595 from anandpdoshi/hotfix

Re-raise error in patch handler
Fixed gravatar in client
Background Style: Fill Screen or Tile
User can disable Print Formats
Ask admin password in --set_admin_password
Show website route for generator via set_intro, fix in Outgoing Email Settings
Fixed delete_doc
Fixed customize form test case
Fixed disable signup
Merge pull request #596 from anandpdoshi/hotfix

Disable Print Format, Fixed gravatar, Background Style, ask Admin password
Clear cache of login page
fix all command in cli
Create CONTRIBUTING.md
assign_to.js bugfix

bug in removing assignment
Merge pull request #598 from pdvyas/hotfix-cli

fix all command in cli
minor fix in get_value