Fixed Gemspec

- Syntax fixes
- Added dependency on nokogiri 1.5.5 to avoid issue with rbvmomi
	(vmware-archive/rbvmomi#31)

vagrant-vcenter.gemspec

@@ -1,4 +1,4 @@
-$:.unshift File.expand_path('../lib', __FILE__)
+$LOAD_PATH.unshift File.expand_path('../lib', __FILE__)
 require 'vagrant-vcenter/version'
 
 Gem::Specification.new do |s|
@@ -11,17 +11,18 @@ Gem::Specification.new do |s|
   s.license = 'MIT'
   s.summary = 'VMware vCenter® Vagrant provider'
   s.description = 'Enables Vagrant to manage machines with VMware vCenter®.'
-  
+
   s.add_runtime_dependency 'rbvmomi', '~> 1.8.1'
   s.add_runtime_dependency 'log4r', '~> 1.1.10'
-
-  s.add_development_dependency "rake"
-  s.add_development_dependency "rspec-core", "~> 2.12.2"
-  s.add_development_dependency "rspec-expectations", "~> 2.12.1"
-  s.add_development_dependency "rspec-mocks", "~> 2.12.1"
-
-  s.files = `git ls-files`.split($/)
-  s.executables = s.files.grep(%r{^bin/}) { |f| File.basename(f) }
-  s.test_files = s.files.grep(%r{^(test|spec|features)/})
+  s.add_runtime_dependency 'nokogiri', '1.5.5'
+
+  s.add_development_dependency 'rake'
+  s.add_development_dependency 'rspec-core', '~> 2.12.2'
+  s.add_development_dependency 'rspec-expectations', '~> 2.12.1'
+  s.add_development_dependency 'rspec-mocks', '~> 2.12.1'
+
+  s.files = `git ls-files`.split($RS)
+  s.executables = s.files.grep(/^bin/) { |f| File.basename(f) }
+  s.test_files = s.files.grep(/^(test|spec|features)/)
   s.require_path = 'lib'
 end