New line at the start of code snippet is stripped in formatted ouput (python)

(Original issue 1116 created by ngzhian on 2015-06-21T19:58:45.145782+00:00)

To reproduce


```
#!python

import pygments

lexer = pygments.lexers.PythonLexer()
formatter = pygments.formatters.TerminalFormatter()
pygments.highlight('\n\n#a', lexer, formatter)  # 2 empty lines then a comment

# outputs: u'\x1b[37m#a\x1b[39;49;00m\n'
```
should the new line at the start be stripped?
