org.sbml.jsbml.util.CobraUtil parses notes incorrectly which are not COBRA notes

[matthiaskoenig]

The CobraUtil.parseCobraNotes(sbase); parses incorrect properties if the notes are not cobra notes but contain HTML with : in a pelement.
This is discussed in matthiaskoenig/cy3sbml#107 where we use the method to retrieve the cobra fields.
Unfortunately, this gives false positive properties.

This basically just checks for

<p>KEY:VALUE</p>

and gives false positives for every : in a p element.
The parser should be more robust.