caching the http version.

The syntax for including an https image url in RDoc taken from
http://about.travis-ci.org/docs/user/status-images. Having this in a
line of its own now to make regex replacement for the API simpler!

Fixes readme links better - earlier links broke when the current page is anything other than github.com/rails/rails/. Even github.com/rails/rails (without the trailing slash) broke the readme links. Also change the rakefile that generates the rdoc readme accordingly

To solve the problem of links being broken in GitHub for the sake of api site, have them replaced at runtime during rdoc generation

backslash insertion for RDoc main page ignores code blocks, also adds comments to explain what's this hack about

With the previous pattern RDoc processed

    railties/lib/rails/generators/rails/plugin_new/templates/test/%name%_test.rb

and that resulted in a spurious "<" class.

fixes a regression introduced by b921679d
require 'rdoc/task' fails if the system RDoc version is below 2.4.2 (e.g. CRuby 1.8.7)

RDoc autolinks the word "Rails" to the doc page for the Rails module.
But README.rdoc is displayed in the home page at GitHub and the slashes
are visible there, which is weird. We leave by now the slashes off in
the file, and generate a second file for the API with them.

adds a publish_docs task to force stable docs generation and publishing after a new stable tag has been pushed

quick hack: hijacks the predicate RDoc::Parser.binary? so that it does not consider a handful of ordinary Ruby files in the Rails tree as binary (and thus excluded from the API)

To understand the changes in horo.rb check rdoc/template.rb in a RDoc 2.x

Signed-off-by: Nwycats <wycats@gmail.com>

Signed-off-by: Nwycats <wycats@gmail.com>