Avoid creating two paragraphs on autolink. Fixes #63.

This has implications for XML namespaced elements, which were
originally always treated as block elements by the top-level paragraph
rule. As a side-effect of this commit, they are now always considered
inline.

lib/marked.js

@@ -55,7 +55,7 @@ block.paragraph = (function() {
   ('heading')
   ('lheading')
   ('blockquote')
-  ('<' + tag())
+  ('<' + tag() + '[\\s>]')
   ('def');
 
   return new

test/new/autolink_lines.html

@@ -0,0 +1,3 @@
+<p>hello world
+<a href="http://example.com">http://example.com</a>
+</p>

test/new/autolink_lines.text

@@ -0,0 +1,2 @@
+hello world
+<http://example.com>

test/tests/autolink_lines.html

@@ -0,0 +1,3 @@
+<p>hello world
+<a href="http://example.com">http://example.com</a>
+</p>

test/tests/autolink_lines.text

@@ -0,0 +1,2 @@
+hello world
+<http://example.com>