add an NSS find module
add a tweaked FindOpenSSL module and link and include it in interface
initial rev of SignedWalletTransaction that creates a message
use OpenSSL to create signed wallet transaction using hard-code key
Merge branch 'master' of github.com:birarda/hifi

Conflicts:
	interface/CMakeLists.txt
Merge branch 'master' of https://github.com/highfidelity/hifi
add dialog to Menu to insert wallet private key
some updates to the BUILD guide for OpenSSL
fix min required OpenSSL version
more tweaks to sections in BUILD guide
more cleanup to dependencies section of cmake
Merge branch 'master' of https://github.com/highfidelity/hifi
fix for select_library_configurations in OpenSSL find module
add hifi_lib_dir hint to win32 section of FindOpenSSL
add a debug to catch optimized lib
don't pass OpenSSL libraries as string
Merge pull request #3181 from birarda/master

foundation of support for signed transactions from interface