Add new snippets for rspec

snippets/ruby.snippets

@@ -723,3 +723,11 @@ snippet is
 	it { should ${0} }
 snippet isn
 	it { should_not ${0} }
+snippet iexp
+  it { expect(${1:object}).${1} ${0} }
+snippet iexpb
+  it { expect { ${1:object} }.${1} ${0} }
+snippet iiexp
+  it { is_expected.to ${0} }
+snippet iiexpn
+  it { is_expected.not_to ${0} }