Updated changelog and bump version to 0.5.7.1.
Made compileRegex non monadic and added a caseSensitive parameter.

Checking state for this parameter was slowing things down 2x
from 0.5.6 speeds.
Preliminary changes for UTF-8 support.

This patch includes everything from the patch by mcmtroffaes
in #42 except the compUTF8 option itself, which is commented
out pending release of a version of pcre-regex-builtin that supports
it.

When a supporting version is released, we can remove the comment
here, conditionally on the version of pcre-regex-builtin.

See #42.
Indicate output formats in README.  Closes #43.
Turn on utf8 support and require latest regex-pcre-builtin.

Closes #42.
Renamed README README.md.
Bump version to 0.5.8.
Updated changelog.
Fix in changelog.
Merge pull request #45 from mcmtroffaes/patch-1

Fix in changelog.
Give more information on regex compile failure.
Updated fsharp and ocaml xml files for pcre syntax compatibility.

We need `\355`, not `\0355`.  See the pcre man page.

Closes #44.
Really fix #44.

Apparently we need `\o{0366}`.
Updated changelog.
Version bump to 0.5.8.1.