Moved connection.rb into fdbsql.rb
Moved dataset.rb into fdbsql.rb
Moved features.rb into fdbsql.rb
Moved prepared_statements.rb into fdbsql.rb
Removed old include calls
Moved date_arithmetic.rb into fdbsql.rb
Moved schema_parsing.rb into fdbsql.rb
Added necessary require that I missed earlier
Correctly set DatasetClass

Had to declare it first; it was using the Sequel::Dataset class
Merge branch '4.13.0' into prep-for-upstream

Conflicts:
	lib/sequel/adapters/fdbsql/dataset.rb
There was one change in dataset.rb which is gone now, added that
to fdbsql.rb
prepped connection_spec to hold all specs
Moved database_spec into fdbsql_spec
Moved dataset_spec into fdbsql_spec
Merge pull request #9 from ScottDugas/prep-for-upstream

Prep for upstream