make buildInlinePattern support for '/'

[caogecym]

No description provided.

[ashb]

I wasn't aware that '/' needs to be escaped. How to other parsers handle this?

If other parsers behave like this can you add a test case for this? Should be quite easy to expand this

markdown-js/test/regressions.t.js

Lines 436 to 440 in 9782714

	test( "inline_escape", function(t, md) {
	t.equivalent( md.processInline("\\bar"), [ "\\bar" ], "invalid escape" );
	t.equivalent( md.processInline("\\>"), [ ">" ], "escapes >" );
	t.equivalent( md.processInline("\\*foo*"), [ "*foo*" ], "escaped em" );
	});