New build system
Merge pull request #95 from vhbit/custom-build

New build system
Add XTS-AES mode
Merge pull request #96 from coyotebush/xts

Add XTS-AES mode
Move AES XTS support to a feature
Fix travis features
Impl Error for SslError
Fixed compilation errors related to namedspaced enums
Merge pull request #98 from jamesrhurst/namespaced-enums

Fixed compilation errors related to namedspaced enums
Remove Zero and One impls
Baseline server support

Allows calling SSL_accept() instead of SSL_connect() when creating an
SslStream.