initial import

source copied in from
https://github.com/cyberphone/json-canonicalization/tree/master/go

# Please enter the commit message for your changes. Lines starting
# with '#' will be ignored, and an empty message aborts the commit.
#
# On branch master
#
# Initial commit
#
# Changes to be committed:
#	new file:   README.md
#	new file:   test/verify-canonicalization.go
#	new file:   test/verify-numbers.go
#	new file:   webpki.org/jsoncanonicalizer/es6numfmt.go
#	new file:   webpki.org/jsoncanonicalizer/jsoncanonicalizer.go
#
