Add GHASH for ARMv8 Crypto Extension.

Result of joint effort with Ard Biesheuvel.
Engage GHASH for ARMv8.
sha[1|512]-armv8.pl: get instruction endianness right.

Submitted by: Ard Biesheuvel.
ARM assembly pack: get ARMv7 instruction endianness right.

Pointer out and suggested by: Ard Biesheuvel.
Fixed minor duplication in docs
Add official extension value.

Encrypt then MAC now has an official extension value, see:

http://www.ietf.org/id/draft-ietf-tls-encrypt-then-mac-02.txt
Make tls_session_secret_cb work with CVE-2014-0224 fix.

If application uses tls_session_secret_cb for session resumption
set the CCS_OK flag.
Create ~/.rnd with mode 0600 instead of 0666

Because of a missing include <fcntl.h> we don't have O_CREATE and don't create
the file with open() using mode 0600 but fall back to using fopen() with the
default umask followed by a chmod().

Problem found by Jakub Wilk <jwilk@debian.org>.
Link heartbeat_test with the static version of the libraries

It's using an internal API that that might not be available in the shared
library.
Create test/testutil.h for unit test helper macros

Defines SETUP_TEST_FIXTURE and EXECUTE_TEST, and updates ssl/heartbeat_test.c
using these macros. SETUP_TEST_FIXTURE makes use of the new TEST_CASE_NAME
macro, defined to use __func__ or __FUNCTION__ on platforms that support those
symbols, or to use the file name and line number otherwise. This should fix
several reported build problems related to lack of C99 support.
test/README and test template generator
Environment variables and aliases for unit testing
Add debug-test-64-clang Configure target

Apparently clang 3.1, which ships with FreeBSD 9.1, completely ignores
-fsanitize. Clang 3.3, which ships with FreeBSD 9.2, compiles with it, but
fails to link due to the absence of libasan:

http://lists.freebsd.org/pipermail/freebsd-hackers/2013-December/043995.html
https://www.mail-archive.com/cfe-commits@cs.uiuc.edu/msg92260.html
http://reviews.llvm.org/D2644
Add cscope and ctags files to .gitignore
Turn aliases into functions; add cscope and ctags