Add the ability to accept LaTeX and Markdown/MathJax formulas in Indico abstract editor

by Pedro Gaudêncio for CERN SFT

My proposal consists on improving Indico abstract editor to be able to accept LaTeX and Markdown/MathJax formulas to generate HTML and PDF compiled outputs. Using PageDown editor to translate the plain text from input to LaTeX documents ("book of abstracts") and HTML while live previewing the edition on a canvas.