Add liquid.cr support

shard.yml

@@ -13,3 +13,5 @@ development_dependencies:
     github: MakeNowJust/crustache
   temel:
     github: f/temel
+  liquid:
+    github: Techmagister/liquid.cr

spec/fixtures/test.liquid

@@ -0,0 +1 @@
+<span>{{ process.pid }}</span>

spec/kilt/liquid_spec.cr

@@ -0,0 +1,11 @@
+require "../spec_helper"
+require "../../src/liquid"
+
+class LiquidView
+  @process = { "pid" => Process.pid }
+  Kilt.file "spec/fixtures/test.liquid"
+end
+
+it "works with classes" do
+  LiquidView.new.to_s.should eq("<span>#{Process.pid}</span>\n")
+end

src/liquid.cr

@@ -0,0 +1,4 @@
+require "./kilt"
+require "liquid"
+
+Kilt.register_engine "liquid", Liquid.embed