Don't require spacing around math spans (fix #120)
Modify tests accordingly
Merge pull request #125 from jmendeth/lift-math-restrictions

Don't require spacing around math spans (fix #120)
Remove HTML_SAFELINK and EXT_LAX_SPACING
Merge pull request #129 from jmendeth/remove-flags

Remove HTML_SAFELINK and EXT_LAX_SPACING
Fix a few typos