[#604] Remove the leading newline from Liquid blocks for easier formatting

lib/chili_project/liquid/liquid_ext.rb

 module ChiliProject
   module Liquid
     module LiquidExt
+      ::Liquid::Block.send(:include, Block)
       ::Liquid::Context.send(:include, Context)
     end
   end

lib/chili_project/liquid/liquid_ext/block.rb

+module ChiliProject
+  module Liquid
+    module LiquidExt
+      module Block
+        def self.included(base)
+          base.send(:include, InstanceMethods)
+          base.class_eval do
+            alias_method_chain :render_all, :cleaned_whitespace
+          end
+        end
+
+        module InstanceMethods
+          def render_all_with_cleaned_whitespace(list, context)
+            # Remove the leading newline in a block's content
+            list[0].sub!(/\A\r?\n/, "") if list[0].is_a?(String)
+            render_all_without_cleaned_whitespace(list, context)
+          end
+        end
+      end
+    end
+  end
+end
\ No newline at end of file