mod_mailinglist: Make bounce dialog nicer

Also show the bounce reason per recipient. This is currently very
inefficient as it does a query per recipient, but the bounce dialog is
not meant for handling big (100+) bounce lists anyway.
zotonic-tpl-mode: fix bug in find tag soup open tag when encountering a self closed tag.

Empty string is truthy in elisp. My bad.
Thanks @arjan for reporting :)
Merge pull request #556 from cillianderoiste/master

doc: minor stylistic tweaks and spelling corrections
mod_l10n: Added South Sudan. Needs additional translations
mod_authentication: make the password reset available when logged on
mod_authentication: fixed reminder link in error message.
mod_mailinglist: Only show addresses in bounce dialog for the current mailing page

This way, the number in the overview (http://stick.im/s/u5a)
always corresponds to the number of rows in the bounce dialog. (http://stick.im/s/LW8)
mod_base: fixes for wired id css selector support in combination with a postback.
This hack should be replaced with proper 'selector' support for wired targets.
core: don't change the language on internal page_path rewrites.
Fixes #559
core: Add ua class variable to start script to fix #561
doc: minor tweaks to the dispatch documentation.

Thanks go to @ArthurClemens.
Fixes 563.
core: clean shutdown during boot in case of dependency start failures.

Instead of getting a nasty looking:
{"init terminating in do_boot",{{case_clause,{error,{"no such file or directory","xmerl.app"}}},[{zotonic,ensure_started,1},{zotonic,ensure_started,1},{zotonic,start,1},{init,start_it,1},{init,start_em,1}]}}

Give a:
10:14:41.213 [error] Zotonic failed to start application: no such file or directory: xmerl.app
smtp: fix e-mail receive.
core: add support for {skeleton, <skel>} in site config install_modules list.
core: fix indentation in m_config:all/1.
core: Fix for websocket handshake when qs has more than one parameter
Merge branch 'master' of https://github.com/zotonic/zotonic
mod_acl_adminonly: as all users should be equal, i.e. admins, z_acl:is_admin/1 should return true.

And z_acl:is_admin/1 looks at #context.acl being 'admin' for that.
mod_acl_adminonly: fix, set_admin is not exported by z_acl
mod_admin/mod_admin_frontend: made admin more responsive. Added first version of frontend editor based on mod_admin.