update ims-lti gem to fix specs

fixes PLAT-676

test-plan:
specs should pass

Change-Id: I39118e706ab6b6b8ed83f4914407ac2388cfb886
Reviewed-on: https://gerrit.instructure.com/42521
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Brad Humphrey <brad@instructure.com>
Product-Review: Nathan Mills <nathanm@instructure.com>
QA-Review: Nathan Mills <nathanm@instructure.com>

Gemfile.d/other_stuff.rb

@@ -46,7 +46,7 @@ gem 'i18n', '0.6.9'
 gem 'i18nema', '0.0.8', :platforms => [:mri_20, :mri_21]
 gem 'i18nema19', '0.0.8', :platform => :mri_19
 gem 'icalendar', '1.5.4'
-gem 'ims-lti', '2.0.0.beta.7'
+gem 'ims-lti', '2.0.0.beta.10'
 gem 'jammit', :github => 'documentcloud/jammit', :ref => '98b50a67029c2860717485a72a2ff0ae8ec37840'
   gem 'cssmin', '1.0.3'
   gem 'jsmin', '1.0.1'

spec/controllers/lti/message_controller_spec.rb

@@ -83,7 +83,6 @@ module Lti
         end
 
         it 'returns the signed params' do
-          pending("failing")
           get 'basic_lti_launch_request', account_id: account.id, message_handler_id: message_handler.id, params: {tool_launch_context: 'my_custom_context'}
           response.code.should == "200"
 
@@ -104,7 +103,6 @@ module Lti
         end
 
         it 'does custom variable expansion for tool settings' do
-          pending("failing")
           parameters = %w( LtiLink.custom.url ToolProxyBinding.custom.url ToolProxy.custom.url ).map do |key|
             IMS::LTI::Models::Parameter.new(name: key.underscore, variable: key )
           end