Backend: Upgrade To Jekyll 1.3.0 & Remove Workarounds

* Require in Makefile that everyone use bundle to remove inconsistencies

* Require in Gemfile that everyone use Jekyll 1.3.*

* Require in Gemfile that everyone use Ruby 2.0.0 (already used by
  Travis and most developers)

* Remove workaround _plugin/svg.rb which showed SVG files in `jekyll
  serve` (fixed in Jekyll 1.0.0)

* Remove inconsistent file path workarounds in _plugins/autocrossref.rb
  and _plugins/inline-template.rb

Gemfile

@@ -1,10 +1,15 @@
 source 'https://rubygems.org'
 
-#ruby '2.0.0'
+## If you update the version here, also update it in .travis.yml and
+## README.md. Then push your branch and make sure Travis supports that
+## version. Then remind one of the site maintainers that they need to
+## run `rvm install <VERSION>` on the build server(s) before they commit
+## to master
+ruby '2.0.0'
 
 group :development do
   gem 'ffi-icu'
-  gem 'jekyll'
+  gem 'jekyll', '~>1.3.0'
   gem 'json'
   gem 'less'
   gem 'kramdown'

Gemfile.lock

@@ -80,7 +80,7 @@ DEPENDENCIES
   RedCloth
   ffi-icu
   html-proofer
-  jekyll
+  jekyll (~> 1.3.0)
   json
   kramdown
   less

Makefile

@@ -4,13 +4,6 @@
 S=@  ## Silent: only print errors by default; 
      ## run `make S='' [other args]` to print commands as they're run
 
-## Old versions of jekyll must not call "build".  If you have one of
-## these versions, either run make like this: make JEKYLL_COMMAND=jekyll
-## or create the JEKYLL_COMMAND environmental variable:
-# echo 'export JEKYLL_COMMAND=jekyll' >> ~/.bashrc
-# exec bash
-# make
-JEKYLL_COMMAND ?= "bundle exec jekyll build"
 SITEDIR=_site
 JEKYLL_LOG=._jekyll.log
 
@@ -74,7 +67,7 @@ ERROR_ON_OUTPUT="sed '1s/^/ERROR:\n/' | if grep . ; then sed 1iERROR ; false ; e
 ## Always build using the default locale so log messages can be grepped.
 ## This should not affect webpage output.
 build:
-	$S export LANG=C.UTF-8 ; eval $(JEKYLL_COMMAND) 2>&1 | tee $(JEKYLL_LOG)
+	$S export LANG=C.UTF-8 ; bundle exec jekyll build 2>&1 | tee $(JEKYLL_LOG)
 	$S grep -r -L 'Note: this file is built non-deterministically' _site/ \
 	  | egrep -v 'sha256sums.txt' \
 	  | xargs sha256sum > _site/sha256sums.txt

_plugins/autocrossref.rb

@@ -33,12 +33,10 @@ require 'yaml'
     def render(context)
       output = super
 
-      ## Workaround for inconsistent relative directory
-      path = File.expand_path(File.dirname(__FILE__)) + "/.."
       ## Load terms from file
       site = context.registers[:site].config
       if !site.has_key?("crossref")
-        site['crossref'] = YAML.load_file(path + "/_autocrossref.yaml")
+        site['crossref'] = YAML.load_file("_autocrossref.yaml")
       end
 
       ## Sort terms by reverse length, so longest matches get linked

_plugins/inline-template.rb

@@ -23,11 +23,8 @@ require 'yaml'
     def render(context)
       output = super
 
-      ## Workaround for inconsistent relative directory
-      path = File.expand_path(File.dirname(__FILE__)) + "/../"
-
       data = YAML.load(output)
-      template = File.open(path + @template_name, mode="r")
+      template = File.open(@template_name, mode="r")
       @mytemplate = Liquid::Template.parse(template.read())
       @mytemplate.render('entry' => data)
     end

_plugins/svg.rb

@@ -1,10 +0,0 @@
-# This file is licensed under the MIT License (MIT) available on
-# http://opensource.org/licenses/MIT.
-
-#svg.rb is a workaround to allow built-in jekyll server
-#to serve svg files with jekyll --server.
-
-require 'webrick'
-include WEBrick
-
-WEBrick::HTTPUtils::DefaultMimeTypes.store 'svg', 'image/svg+xml'