Removing docs for mounting multiple apps.

Mounting multiple Dancer apps via Plack::Builder is broken, has always
been broken, and will not be fixed in the near future. We should not
encourage this approach by documenting it.
Fix pesky "Use of uninitialized value $version..." message when loading plugins.

Appears when plugins without a $VERSION are loaded by
Dancer::Handler::Standalone.  Replaced with a "no version number defined"
message.
shorten the code
Merge branch 'remove-uninitialized' into devel
Typo: template -> tokens
Merge pull request #847 from jwittkoski/template_doc_typo

Typo: template -> tokens
sane utf logging
Merge branch 'pr/sane-utf-logging' into devel
yaml atomic write
Merge branch 'yaml-atomic-write' into devel
serve autopages with text/html content-type
Merge branch 'autopages-content-type' into devel
send a Last-Modified header for static files
handle If-Modified-Since header in the request for static files
neither HTTP::Parser::XS or HTTP::Parser is loaded during this test
test for If-Modified-Since support when dealing with static files
Merge branch 'if-modified-since' into devel
more abstract way to atomic write
rename is better
unneeded dep