Fix fenced code processing inside blockquotes

Add a call to fenced code block processor inside the loop that's
responsible for collecting the quoted lines. Grok all the fenced code
block as a part of the quoted text.

Closes #122.

block.go

@@ -909,7 +909,17 @@ func (p *parser) quote(out *bytes.Buffer, data []byte) int {
 	beg, end := 0, 0
 	for beg < len(data) {
 		end = beg
+		// Step over whole lines, collecting them. While doing that, check for
+		// fenced code and if one's found, incorporate it altogether,
+		// irregardless of any contents inside it
 		for data[end] != '\n' {
+			if p.flags&EXTENSION_FENCED_CODE != 0 {
+				if i := p.fencedCode(out, data[end:], false); i > 0 {
+					// -1 to compensate for the extra end++ after the loop:
+					end += i - 1
+					break
+				}
+			}
 			end++
 		}
 		end++

block_test.go

@@ -1065,6 +1065,78 @@ func TestFencedCodeBlock(t *testing.T) {
 	doTestsBlock(t, tests, EXTENSION_FENCED_CODE)
 }
 
+func TestFencedCodeInsideBlockquotes(t *testing.T) {
+	var tests = []string{
+		"> ```go\n" +
+			"package moo\n\n" +
+			"```\n",
+		`<blockquote>
+<pre><code class="language-go">package moo
+
+</code></pre>
+</blockquote>
+`,
+		// -------------------------------------------
+		"> foo\n" +
+			"> \n" +
+			"> ```go\n" +
+			"package moo\n" +
+			"```\n" +
+			"> \n" +
+			"> goo.\n",
+		`<blockquote>
+<p>foo</p>
+
+<pre><code class="language-go">package moo
+</code></pre>
+
+<p>goo.</p>
+</blockquote>
+`,
+		// -------------------------------------------
+		"> foo\n" +
+			"> \n" +
+			"> quote\n" +
+			"continues\n" +
+			"```\n",
+		"<blockquote>\n" +
+			"<p>foo</p>\n\n" +
+			"<p>quote\n" +
+			"continues\n" +
+			"```</p>\n" +
+			"</blockquote>\n",
+
+		"> foo\n" +
+			"> \n" +
+			"> ```go\n" +
+			"package moo\n" +
+			"```\n" +
+			"> \n" +
+			"> goo.\n" +
+			"> \n" +
+			"> ```go\n" +
+			"package zoo\n" +
+			"```\n" +
+			"> \n" +
+			"> woo.\n",
+		`<blockquote>
+<p>foo</p>
+
+<pre><code class="language-go">package moo
+</code></pre>
+
+<p>goo.</p>
+
+<pre><code class="language-go">package zoo
+</code></pre>
+
+<p>woo.</p>
+</blockquote>
+`,
+	}
+	doTestsBlock(t, tests, EXTENSION_FENCED_CODE)
+}
+
 func TestTable(t *testing.T) {
 	var tests = []string{
 		"a | b\n---|---\nc | d\n",