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Add a datediff implementation for postgres (dbt-labs#187)

Add datediff implementation for postgres

Add unique_combination_of_columns test (dbt-labs#177)

Merge pull request dbt-labs#161 from MartinGuindon/feature/relationsh…

…ips_where

Add a new schema test: relationships_where

Merge pull request dbt-labs#158 from clausherther/fix/get_tables_by_p…

…refix_sql_database

Adds database parameter

Merge pull request dbt-labs#152 from emilieschario/master

Resolve "get_column_values returns an error if passed a `ref`, but the model has not been previously built"

Merge pull request dbt-labs#149 from fishtown-analytics/fix/0.14.0-co…

…mpat

Fix/0.14.0 compat

Replace logging in insert-by-period materialization

Merge pull request dbt-labs#144 from fishtown-analytics/refactor/readme

Point to hub for installation instructions

Merge pull request dbt-labs#135 from ArtifactUprising/feature/pivot-q…

…uote-parameter

Added quote_identifiers argument