Revert "Support svg as preview."

This reverts commit 283a88061389970a196cde1ecfdde76e42503a77.
No soft-wrapping in tables.
Add a workaround for MathJax MathML issues.
Update html_table.css
Use view factory to spawn formula view.
Merge branch 'master' of https://github.com/elifesciences/lens-article
Merge branch 'master' into formula_references

Conflicts:
	nodes/formula/formula_view.js
Fix regressions.