fix the bug render of ref and nolink
add unit test for function convertHTMLtoMarkdown
agree to individual CLA and remove the copyright line
Merge remote-tracking branch 'upstream/master'
Moved PR #232 tests into Mocha.
Merge branch 'pr/232' into development
Added changelist item for fix to #233
Modified CLA to a gentler form.

Previously (yesterday) it was an "assignment agreement", but after re-reading it today (and reading other CLAs) I see that the contributor effectively has to give up all control -- like, "exclusive license" kind of thing. That's overreaching and unnecessary. So I'm changing it to a "more standard" style of agreement.

I have also updated my own contributor agreement file.