Add 'jekyll-release' gem to the 'example/' directory.

This gem provides a 'release' command for jekyll that commits the generated site
to the 'gh-pages' branch of the git repository. This makes it possible to commit
the build without using multiple checkouts or switching branches and moving
files around.

At the moment the target branch is not configurable.

Author: nishantjr

example/jekyll-release/.gitignore

@@ -0,0 +1 @@
+/.build/

example/jekyll-release/Build

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+#!/bin/bash
+set -e
+
+echo Building gem in $(dirname $0)/.build/
+cd $(dirname $0)
+
+rm -rf .build
+mkdir -p .build/lib .build/bin
+cp jekyll-release.rb .build/lib/
+cp ../../git-commit-filetree .build/bin/
+(cd .build && gem build ../jekyll-release.gemspec)

example/jekyll-release/jekyll-release.gemspec

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+Gem::Specification.new do |s|
+    s.name        = 'jekyll-release'
+    s.version     = '0.0.1'
+    s.summary     =
+        'Release Jekyll-generated websites to a git branch in a single command.'
+    s.description =
+        "A Jekyll plugin that provides a 'release' command for jekyll that " +
+        "commits the generated site to the 'gh-pages' branch of the git " +
+        "repository. This makes it possible to commit the build without using "+
+        "multiple checkouts or switching branches and moving files around."
+
+    s.authors     = ['Nishant Rodrigues', 'Curt Sampson']
+    s.email       = 'nishantjr@gmail.com'
+    s.homepage    = 'http://github.com/cjs-cynic-net/git-commit-filetree'
+    s.files       = ['lib/jekyll-release.rb']
+    s.executables = ['git-commit-filetree']
+end

example/jekyll-release/jekyll-release.rb

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+class ReleaseCommand < Jekyll::Command
+    class << self
+        def init_with_program(prog)
+            prog.command(:release) { |c|
+                c.syntax "release"
+                c.description 'Release current build to gh-pages branch.'
+                c.action { |args, options|
+                    build_options = options.dup
+                    build_options['quiet'] = true
+                    Jekyll::Commands::Build.process(build_options)
+                    process(options)
+                }
+            }
+        end
+
+        def process(options)
+            dest = configuration_from_options(options)['destination']
+            system(Gem.bin_path('jekyll-release', 'git-commit-filetree'), 'gh-pages', dest) \
+                || fail('git-commit-filetree failed.')
+        end
+    end
+end