dont replace newlines and tabs with spaces

this should fix #17, as all leading new lines
were replaced with a single space, which in turn
was rendered before the # of a headline

markdownify/__init__.py

@@ -5,7 +5,7 @@ import six
 
 convert_heading_re = re.compile(r'convert_h(\d+)')
 line_beginning_re = re.compile(r'^', re.MULTILINE)
-whitespace_re = re.compile(r'[\r\n\s\t ]+')
+whitespace_re = re.compile(r'[\t ]+')
 html_heading_re = re.compile(r'h[1-6]')
 
 

tests/test_basic.py

@@ -10,4 +10,4 @@ def test_soup():
 
 
 def test_whitespace():
-    assert md(' a  b \n\n c ') == ' a b c '
+    assert md(' a  b \t\t c ') == ' a b c '

tests/test_conversions.py

@@ -106,6 +106,10 @@ def test_hn():
     assert md('<h3>Hello</h3>') == '### Hello\n\n'
     assert md('<h6>Hello</h6>') == '###### Hello\n\n'
 
+def test_hn_chained():
+    assert md('<h1>First</h1>\n<h2>Second</h2>\n<h3>Third</h3>', heading_style=ATX) == '# First\n\n\n## Second\n\n\n### Third\n\n'
+    assert md('X<h1>First</h1>', heading_style=ATX) == 'X# First\n\n'
+
 
 def test_hn_nested_tag_heading_style():
     assert md('<h1>A <p>P</p> C </h1>', heading_style=ATX_CLOSED) == '# A P C #\n\n'