Convert <newline> inside <item> and <newline effect="normal"> inside <para>

<newline effect="underline"/> inside a <para> results in invalid HTML.
I don't know if we should convert it anyway or not.  Right now we'll get
"NOT_CONVERTED_YET".
Merge pull request #35 from Connexions/fix-newline

Convert <newline> inside <item> and <newline effect="normal"> inside <para>