HYDRA-470: moving from jeweller to bundler for gem management

Adds bundler as the gem management utility; removes jeweller rake tasks,
moves VERSION to lib/active_fedora/version.rb, adds bundler rake tasks,
and cleans up active_fedora.gemspec file.

https://jira.duraspace.org/browse/HYDRA-470

Rakefile

@@ -1,46 +1,14 @@
 require 'rake/clean'
 require 'rubygems'
+require 'bundler'
 
 $: << 'lib'
 
+Bundler::GemHelper.install_tasks
+
 # load rake tasks defined in lib/tasks
 Dir["lib/tasks/**/*.rake"].each { |ext| load ext } if defined?(Rake)
 
-begin
-  require 'jeweler'
-  Jeweler::Tasks.new do |gem|
-    gem.name = "active-fedora"
-    gem.summary = %Q{A convenience libary for manipulating MODS (Metadata Object Description Schema) documents.}
-    gem.description = %Q{ActiveFedora provides for creating and managing objects in the Fedora Repository Architecture.}
-    gem.email = "[email protected]"
-    gem.homepage = "http://yourmediashelf.com/activefedora"
-    gem.authors = ["Matt Zumwalt", "McClain Looney"]
-    gem.rubyforge_project = 'rubyfedora'
-    gem.add_dependency('solr-ruby', '>= 0.0.6')
-    gem.add_dependency('xml-simple', '>= 1.0.12')
-    gem.add_dependency('mime-types', '>= 1.16')
-    gem.add_dependency('multipart-post')
-    gem.add_dependency('nokogiri')
-    gem.add_dependency('om', '>= 1.0')
-    gem.add_dependency('solrizer', '>1.0.0')
-    gem.add_dependency("activeresource")
-    gem.add_dependency("mediashelf-loggable")
-    gem.add_dependency("equivalent-xml")
-    gem.add_dependency("facets")
-    gem.add_development_dependency("yard")
-    gem.add_development_dependency("RedCloth")
-    gem.add_development_dependency("rcov")
-    gem.add_development_dependency("solrizer")
-    gem.add_development_dependency("solrizer-fedora")
-    gem.add_development_dependency("jettywrapper")
-    # gem is a Gem::Specification... see http://www.rubygems.org/read/chapter/20 for additional settings
-  end
-  Jeweler::GemcutterTasks.new
-  # Jeweler::RubyforgeTasks.new 
-rescue LoadError
-  puts "Jeweler (or a dependency) not available. Install it with: gem install jeweler"
-end
-
 CLEAN.include %w[**/.DS_Store tmp *.log *.orig *.tmp **/*~]
 
 task :default => [:spec]