Allow skipping specific tests from a suite.
Include MarkdownTest_1.0.3
add <or> profiling option
makefile
Add a "****" token. Turns out not to be emph or bold.
Merge branch 'or-profiler' of https://github.com/stchang/markdown into stchang-or-profiler

* 'or-profiler' of https://github.com/stchang/markdown:
  add <or> profiling option
Disable OR-DEBUG by default.
Merge branch 'stchang-or-profiler'

* stchang-or-profiler:
  Disable OR-DEBUG by default.
  add <or> profiling option
Enhance <or> debugging.

- Record empty as well as consumed.
- Move the result-printing to its own macro.
- Show srcloc of each <or>.
- Show totals and grand totals for consumed and empty.
@stchang optimization suggestions

Focusing on <or> parsers: Re-order or eliminate.
Move the <or> debug stuff to parsack.rkt.

That way it can cover <or> in modules like entity.rkt and html.rkt, too.
Refactor entity grammar for common prefixes
Use (lookAhead (char #\<)) to optimize.

This gets most of the benefit of refactoring the grammar for the #\<
common prefix, but by using `lookAhead` to avoid actually doing that.
Better comments for $whitespace

Since it got refactored in commit 9a44ed1
Common-prefix refactor $para and $setext-heading.

About 30% faster on perf-test.rkt.
Bump to v0.17