added specs for #get?

spec/unit/request/get_spec.rb

@@ -0,0 +1,15 @@
+require 'spec_helper'
+
+describe Zero::Request do
+  subject { Zero::Request.new(env) }
+
+  context "with a get request" do
+    let(:env) { EnvGenerator.get('/foo') }
+    its(:get?) { should be(true) }
+  end
+
+  context "with a post request" do
+    let(:env) { EnvGenerator.post('/foo') }
+    its(:get?) { should be(false) }
+  end
+end