Added fillmurray

Closes #673

README.md

@@ -715,6 +715,19 @@ Faker::Placeholdit.image("50x50", 'jpg', 'ffffff', '000', 'Some Custom Text') #=
 
 ```
 
+###FAKER::Fillmurray
+-------------------
+
+```ruby
+
+Faker::Fillmurray.image #=> "http://fillmurray.com/300/300"
+
+Faker::Fillmurray.image(true) #=> "http://fillmurray.com/g/300/300"
+
+Faker::Fillmurray.image(false, 200, 400) #=> "http://fillmurray.com/200/400"
+
+```
+
 ###Faker::Hipster
 ----------------
 Adapted from [Hipster Ipsum](http://hipsum.co/)

lib/faker.rb

@@ -242,6 +242,7 @@ def unique(max_retries = 10_000)
 require 'faker/twin_peaks'
 require 'faker/lord_of_the_rings'
 require 'faker/rock_band'
+require 'faker/fillmurray'
 
 require 'extensions/array'
 require 'extensions/symbol'

lib/faker/fillmurray.rb

@@ -0,0 +1,18 @@
+
+
+module Faker
+  class Fillmurray < Base
+    class << self
+
+      def image(grayscale = false, width = 200, height = 200)
+        raise ArgumentError, "Width should be a number in string format" unless width.match(/^[0-9]+$/)
+        raise ArgumentError, "Height should be a number in string format" unless height.match(/^[0-9]+$/)
+        raise ArgumentError, "Grayscale should be a boolean" unless [true, false].include?(grayscale)
+
+        fillmurray_url = grayscale == true ? "https://fillmurray.com/g/#{width}/#{height}" : "https://fillmurray.com/#{width}/#{height}"
+
+        fillmurray_url
+      end
+    end
+  end
+end

test/test_faker_fillmurray.rb

@@ -0,0 +1,34 @@
+require File.expand_path(File.dirname(__FILE__) + '/test_helper.rb')
+
+class TestFakerFillmurray < Test::Unit::TestCase
+  def setup
+    @tester = Faker::Fillmurray
+  end
+
+  def test_fillmurray
+    assert @tester.image(false, '300', '300').match(/https:\/\/fillmurray\.com\/(\d+)\/(\d+)/) != nil
+  end
+
+  def test_fillmurray_with_grayscale
+    assert @tester.image(true, '300', '300').match(/https:\/\/fillmurray\.com\/(g?\/?)(\d+)\/(\d+)/)[1] == 'g/'
+  end
+
+  def test_fillmurray_with_incorrect_height_format
+    assert_raise ArgumentError do
+      @tester.image(false, '300', 'nine-thousand')
+    end
+
+  end
+
+  def test_fillmurray_with_incorrect_width_format
+    assert_raise ArgumentError do
+      @tester.image(false, 'three-hundred')
+    end
+  end
+
+  def test_fillmurray_with_incorrect_grayscale
+    assert_raise ArgumentError do
+      @tester.image('gray', '300', '400')
+    end
+  end
+end