Fix pythonRun and pythonCoding groups.

Thanks to @ZDBioHazard.

Author: wmvanvliet

syntax/python.vim

@@ -136,8 +136,8 @@ syn match   pythonDot        '\.' display containedin=pythonDottedName
 
 syn match   pythonComment       '#.*$' display contains=pythonTodo,@Spell
 if !s:Enabled('g:python_highlight_file_headers_as_comments')
-    syn match   pythonRun         '\%^#!.*$'
-    syn match   pythonCoding      '\%^.*\%(\n.*\)\?#.*coding[:=]\s*[0-9A-Za-z-_.]\+.*$'
+    syn match   pythonRun         '\%^#!.*$' nextgroup=pythonDocString skipempty
+    syn match   pythonCoding      '\%^.*\%(\n.*\)\?#.*coding[:=]\s*[0-9A-Za-z-_.]\+.*$' nextgroup=pythonDocString skipempty
 endif
 syn keyword pythonTodo          TODO FIXME XXX contained
 
@@ -292,7 +292,6 @@ endif
 
 " Docstrings
 syn match pythonColon ':' nextgroup=pythonDocString skipempty
-syn match pythonStartFile +\%^+ nextgroup=pythonDocString skipempty
 syn region pythonDocString start=+^\s*'''+ skip=+\\'+ end=+'''+ keepend contains=pythonBytesEscape,pythonBytesEscapeError,pythonUniEscape,pythonUniEscapeError,pythonDocTest,pythonSpaceError,@Spell
 syn region pythonDocString start=+^\s*"""+ skip=+\\"+ end=+"""+ keepend contains=pythonBytesEscape,pythonBytesEscapeError,pythonUniEscape,pythonUniEscapeError,pythonDocTest2,pythonSpaceError,@Spell
 syn region pythonString start=+^\s*'''+ skip=+\\'+ end=+'''+ keepend contains=pythonBytesEscape,pythonBytesEscapeError,pythonUniEscape,pythonUniEscapeError,pythonDocTest,pythonSpaceError,@Spell