add support for transformations parameter in delete_resources api

Author: nadavofir

lib/api.js

@@ -86,6 +86,9 @@ transformation_string = (transformation) ->
   else
     utils.generate_transformation_string(_.extend({}, transformation))
 
+delete_resources_params = (options, params = {}) ->
+  _.extend(params, api.only(options, "keep_original", "invalidate", "next_cursor", "transformations"))
+
 exports.ping = (callback, options = {}) ->
   call_api("get", ["ping"], {}, callback, options)
 
@@ -153,24 +156,24 @@ exports.delete_resources = (public_ids, callback, options = {}) ->
   resource_type = options["resource_type"] ? "image"
   type = options["type"] ? "upload"
   uri = ["resources", resource_type, type]
-  call_api("delete", uri, _.extend({"public_ids[]": public_ids}, api.only(options, "keep_original", "invalidate")), callback, options)
+  call_api("delete", uri, delete_resources_params(options, {"public_ids[]": public_ids}), callback, options)
 
 exports.delete_resources_by_prefix = (prefix, callback, options = {}) ->
   resource_type = options["resource_type"] ? "image"
   type = options["type"] ? "upload"
   uri = ["resources", resource_type, type]
-  call_api("delete", uri, _.extend({prefix: prefix}, api.only(options, "keep_original", "next_cursor", "invalidate")), callback, options)
+  call_api("delete", uri, delete_resources_params(options, {prefix: prefix}), callback, options)
 
 exports.delete_resources_by_tag = (tag, callback, options = {}) ->
   resource_type = options["resource_type"] ? "image"
   uri = ["resources", resource_type, "tags", tag]
-  call_api("delete", uri, api.only(options, "keep_original", "next_cursor", "invalidate"), callback, options)
+  call_api("delete", uri, delete_resources_params(options), callback, options)
 
 exports.delete_all_resources = (callback, options = {}) ->
   resource_type = options["resource_type"] ? "image"
   type = options["type"] ? "upload"
   uri = ["resources", resource_type, type]
-  call_api("delete", uri, _.extend({all: yes}, api.only(options, "keep_original", "next_cursor", "invalidate")), callback, options)
+  call_api("delete", uri, delete_resources_params(options, {all: yes}), callback, options) 
 
 exports.delete_derived_resources = (derived_resource_ids, callback, options = {}) ->
   uri = ["derived_resources"]