bug fix: delete useless colons when a node with colon parsed.

[junpayment]

When parse scss like below.

script:
  som code;

output like below

<script>some code;</script:>

expected.

<script>some code;</script>

I found it's due to printing end tag when a tag with colon.

[coveralls]

Coverage decreased (-5.7%) to 63.075% when pulling b8ec4a1 on junpayment:master into 42ce8a0 on mattn:master.

[mattn]

Thank you. Could you please add test?

[mattn]

merged. 4b866d4

[junpayment]

thanks a lot.
i will add tests later.