go regexp + RE2 DFA port

import "matloob.io/regexp"

The regexp tests pass. Though there may still be uncaught bugs. Let me know if you find any of them! No guarantees!
regexp/internal/dfa tests are currently failing. I need to fix some thingsn there.
I've got a small change to the DFA that uses package unsafe and makes matches 2x faster. I'll try to get it up soon.
A bunch of cleanup needs to be done all over this package.

Name		Name	Last commit message	Last commit date
Latest commit History 64 Commits
internal		internal
syntax		syntax
testdata		testdata
.gitignore		.gitignore
AUTHORS		AUTHORS
CONTRIBUTORS		CONTRIBUTORS
LICENSE		LICENSE
README.md		README.md
all_test.go		all_test.go
backtrack.go		backtrack.go
example_test.go		example_test.go
exec.go		exec.go
exec2_test.go		exec2_test.go
exec_test.go		exec_test.go
export.sh		export.sh
find_test.go		find_test.go
onepass.go		onepass.go
onepass_test.go		onepass_test.go
regexp.go		regexp.go

matloob/regexp