Initial commit.
First draft.

Not entirely sure the OpenSSL API is being used correctly. Next step is
to write unit tests, and verify against those.
Faffing about with the OpenSSL EVP API.
Looks like a problem in tagging.
Secretbox is operational.
Add working strongbox module.
Add constant time comparison functions.
Merge branch 'master' of github.com:kisom/libcryptobox

Conflicts:
	Makefile.am
	configure.ac
	src/Makefile.am
	src/cryptobox/secretbox.h
	src/cryptobox/strongbox.h
	src/secretbox.c
	src/strongbox.c
	tests/Makefile.am
	tests/secretbox_test.c
	tests/strongbox_test.c
Missed a file.
Tests pass. Merge complete.
Add travis test config.