Made all opentxs-client member functions const
that don't modify their member variables
Merge pull request #105 from BugFreeSoftware/const

Conversion of opentxs-client member functions to const
Defined out non-Windows include file
Merge pull request #127 from BugFreeSoftware/fix_windows

Defined out non-Windows include file
Fixed and added missing include header guard defines
Merge pull request #128 from BugFreeSoftware/fix_guards

Fixed and added missing include header guard defines
remove unused 'bitcoin-crypto' submodule
add crypto++ submodule and build
move to crypto++ zlib
move to crypto++ base64
replace openssl hash with cryptopp
ignore mac openssl deprecated-declarations
update travis to use system openssl on mac