Added support for custom headers in fetch

lib/museum/methods.rb

@@ -1,5 +1,6 @@
 class String
-  def fetch
+  def fetch(headers = {})
+    headers['User-Agent'] = 'GemVein Museum'
     require 'net/http'
     require 'net/https'
 
@@ -8,7 +9,7 @@ def fetch
     http.use_ssl = (uri.scheme == "https")
     http.verify_mode = OpenSSL::SSL::VERIFY_NONE
 
-    request = Net::HTTP::Get.new(uri.request_uri, {'User-Agent' => 'GemVein Museum'})
+    request = Net::HTTP::Get.new(uri.request_uri, headers)
 
     response = http.request(request)
     response.body

museum.gemspec

@@ -2,11 +2,11 @@
 # DO NOT EDIT THIS FILE DIRECTLY
 # Instead, edit Jeweler::Tasks in Rakefile, and run 'rake gemspec'
 # -*- encoding: utf-8 -*-
-# stub: museum 0.1.2 ruby lib
+# stub: museum 0.1.3 ruby lib
 
 Gem::Specification.new do |s|
   s.name = "museum"
-  s.version = "0.1.2"
+  s.version = "0.1.3"
 
   s.required_rubygems_version = Gem::Requirement.new(">= 0") if s.respond_to? :required_rubygems_version=
   s.require_paths = ["lib"]