uses simple_captcha instead of recaptcha [#51]

config/initializers/simple_captcha.rb

@@ -0,0 +1,37 @@
+SimpleCaptcha.always_pass = false
+
+SimpleCaptcha.setup do |sc|
+  # default: 100x28
+  sc.image_size = '120x40'
+
+  # default: 5
+  sc.length = 6
+
+  # default: simply_blue
+  # possible values:
+  # 'embosed_silver',
+  # 'simply_red',
+  # 'simply_green',
+  # 'simply_blue',
+  # 'distorted_black',
+  # 'all_black',
+  # 'charcoal_grey',
+  # 'almost_invisible'
+  # 'random'
+  sc.image_style = 'simply_green'
+
+  # default: low
+  # possible values: 'low', 'medium', 'high', 'random'
+  sc.distortion = 'random'
+
+  # default: medium
+  # possible values: 'none', 'low', 'medium', 'high'
+  sc.implode = 'medium'
+
+  # sc.image_style = 'mycaptha'
+  # sc.add_image_style('mycaptha', [
+  #     "-background '#F4F7F8'",
+  #     "-fill '#86818B'",
+  #     "-border 1",
+  #     "-bordercolor '#E0E2E3'"])
+end