make nokogiri dependency explicit in Gemfile

it used to be that my gem manager picked up on this now I need to spell it out

Gemfile

@@ -1,3 +1,3 @@
 source :rubygems
 
-gemspec
+gem 'nokogiri'

Gemfile.lock

@@ -1,9 +1,3 @@
-PATH
-  remote: .
-  specs:
-    google_directions (0.1.5)
-      nokogiri (>= 1.4.1)
-
 GEM
   remote: http://rubygems.org/
   specs:
@@ -15,4 +9,4 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
-  google_directions!
+  nokogiri

Rakefile

@@ -3,13 +3,13 @@ require 'rubygems'
 require 'rake'
 require 'echoe'
 
-Echoe.new('google_directions', '0.1.6') do |p|
+Echoe.new('google_directions', '0.1.6.2') do |p|
   p.description    = "Ruby-wrapper for Google Directions API.  Can return the drive time and driving distance between to places"
   p.url            = "http://github.com/joshcrews/Google-Directions-Ruby"
   p.author         = "Josh Crews"
   p.email          = "josh@joshcrews.com"
   p.ignore_pattern = ["tmp/*", "script/*"]
-  p.development_dependencies = ['nokogiri >=1.4.1']
+  p.runtime_dependencies = ['nokogiri >=1.4.1']
 end
 
 Dir["#{File.dirname(__FILE__)}/tasks/*.rake"].sort.each { |ext| load ext }