Move the account login uri into a config definition.

Sites can use this to customize the location of the login page without having to subclass all pages that redirect to it when not logged in.
CS and WS on pages updated to use config setting for account login
Fix some copypasta.
Merge pull request #83 from isaacgrant/account-login-uri-as-config-setting

Move the account login uri into a config definition.
Set modified date before processing image.

Allows image to save properly with non-nullable modified date column.
Merge pull request #84 from gauthierm/image-upload-modified-date

Set modified date before processing image.
prepare for release of 2.1.14