Added support for aliased models and source blocks #17
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Added alias support in model parsing. Also added searching for "sources" yml blocks pushing table/column documentation to metabase (defining sources is recommended by dbt best practices and often done in tandem with creating staging models). Allows using "metabase.fk_ref" in sources or models .yml in order explicitly define a metabase relationship to a table which allows us to propagate the FK relationship properly to Metabase regardless of aliasing. metabase.fk_ref is looked for first in meta before falling back to default parser.