Add support for compress argument

app/helpers/filepicker_rails/application_helper.rb

@@ -163,6 +163,10 @@ def filepicker_image_tag(url, image_options={}, image_tag_options={})
     #
     # - `:cache` - Specifies if the image should be cached or not.
     #
+    # - `:compress` - You can take advantage of Filepicker's image compression which utilizes JPEGtran and OptiPNG.
+    #                 The value for this parameter is boolean. If you want to compress your image then the parameter
+    #                 is compress:true. Compression is off/false by default.
+    #
     # #### Examples
     #
     #      filepicker_image_url @user.filepicker_url, w: 160, h: 160, fit: 'clip'
@@ -177,7 +181,7 @@ class FilepickerImageUrl
       CONVERT_OPTIONS = [:w, :h, :fit, :align, :rotate, :crop, :format,
                          :quality, :watermark, :watersize, :waterposition,
                          :crop_first]
-      VALID_OPTIONS   = CONVERT_OPTIONS + [:cache]
+      VALID_OPTIONS   = CONVERT_OPTIONS + [:cache, :compress]
 
       def initialize(url, options = {})
         @url, @options = url, options

spec/helpers/application_helper_spec.rb

@@ -258,6 +258,18 @@ def build_link(options = {})
         end
       end
 
+      describe 'compress' do
+
+        it "have correct url with 'compress' only" do
+          expect(filepicker_image_url("foo", compress: true)).to eq('foo?compress=true')
+        end
+
+        it "have correct url with 'compress' and convert option" do
+          url = 'foo/convert?align=faces&compress=true'
+          expect(filepicker_image_url("foo", compress: true, align: 'faces')).to eq(url)
+        end
+      end
+
       describe "when convert options is already in the url" do
 
         it "merges the options into the query params" do