mod_base: Add 'md5' filter to translate a string to an md5 hex value
Merge pull request #753 from mawuli-ypa/filter-md5

mod_base: Add 'md5' filter to translate a string to an md5 hex value
mod_admin: minor NL translation fix
doc: add example to filter on depiction
mod_admin: Add option 'show_date' to 'latest resources' admin dashboard widget
core: Do not parse the site config file for getting the db options

..as the m_site:all/1 function already has this covered
core: added 'request_context' notification.
Triggered after a request's query arguments are parsed.
doc: fix 'button title' to 'button text'
doc: update Zotonic shell
core: make z_email_embed robust against failed file content data fetches.
core: fix z_file_request fetch to binaries for files streamed from s3