Bug 8798: DBIx::Class base classes for all Koha tables

Bug 8798: DBIx::Class base classes for all Koha tables

* Added base class files for all tables in koha using
DBIx::Class::Schema::Loader.
* Added a (very basic) test file for C4::Context
* Also added dependencies in required files.

To Test:

[1] Install patch
[2] Make sure you can still connect to Koha
[3] You may optionally run this test script:

        use Koha::Database;
        use Data::Dumper;
        my $db = Koha::Database->new();
        my $schema = $db->schema();
        print Dumper($schema->resultset("Borrower"));

    If you run this file you should get a DBIx dump of the borrowers table.

Signed-off-by: wajasu <matted-34813@mypacks.net>
Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>
Signed-off-by: Galen Charlton <gmc@esilibrary.com>