don't try to turn on streaming for non-postgres
bump version and copyright dates
use .ruby-* instead of .rvmrc
move mysql2 gem into Gemfile, so it will only be installed if mysql is already installed
use pry-byebug instead of pry-debugger
update be_false and be_true for newer rspec
>= sequel-4.10.0 no longer has clause_sql
make Restore fail if source directory nonexistent