Centralize external Gem loading

lib/vmpooler.rb

@@ -1,6 +1,15 @@
 require 'rubygems' unless defined?(Gem)
 
 module Vmpooler
+  require 'json'
+  require 'open-uri'
+  require 'rbvmomi'
+  require 'redis'
+  require 'sinatra/base'
+  require 'time'
+  require 'timeout'
+  require 'yaml'
+
   %w( api graphite logger pool_manager vsphere_helper ).each do |lib|
     begin
       require "vmpooler/#{lib}"

lib/vmpooler/api.rb

@@ -1,13 +1,6 @@
 module Vmpooler
   class API
     def initialize
-      require 'sinatra/base'
-
-      require 'json'
-      require 'open-uri'
-      require 'redis'
-      require 'yaml'
-
       # Load the configuration file
       config_file = File.expand_path('vmpooler.yaml')
       $config = YAML.load_file(config_file)

lib/vmpooler/pool_manager.rb

@@ -1,13 +1,6 @@
 module Vmpooler
   class PoolManager
     def initialize
-      require 'json'
-      require 'rbvmomi'
-      require 'redis'
-      require 'time'
-      require 'timeout'
-      require 'yaml'
-
       # Load the configuration file
       config_file = File.expand_path('vmpooler.yaml')
       $config = YAML.load_file(config_file)

lib/vmpooler/vsphere_helper.rb

@@ -3,12 +3,6 @@ require 'rubygems' unless defined?(Gem)
 module Vmpooler
   class VsphereHelper
     def initialize vInfo = {}
-      begin
-        require 'rbvmomi'
-      rescue LoadError
-        raise "Unable to load RbVmomi, please ensure its installed"
-      end
-
       config_file = File.expand_path('vmpooler.yaml')
       vsphere = YAML.load_file(config_file)[:vsphere]