Added rm_math_space to markdown cells in the basichtml.tpl to be rendered ok by mathjax after the nbconvertion.
Filter names cleanup
tex=latex
Merge pull request #3758 from jdfreder/filter_refact

nbconvert: Filter names cleanup

highlight -> highlight2foo
markdown -> markdown2html
python_comment -> comment_lines
rm_ansi -> strip_ansi
rm_dollars -> strip_dollars
rm_fake -> strip_files_prefix
html_text -> html2text
rm_math_space -> strip_math_space
wrap -> wrap_text