Rmoves spark-utils and update README (calogica#57)

Add expect_column_distinct_count_to_equal_other_table (calogica#50)

Merge pull request calogica#45 from calogica/refactor/expect_table_ro…

…w_count_to_equal_other_table-row-condition

Adds ability to set row_condition on row_count tests

Merge pull request calogica#40 from calogica/fix/postgres-support

Add initial Postgres support

Merge pull request calogica#35 from calogica/refactor/test-script

Makes test script more flexible

Merge pull request calogica#29 from b-per/modifications-for-tsql-support

Modifications for tsql support

Merge pull request calogica#23 from calogica/fix/issue-22-datatype

Refactor column type checks to use dtype

Merge pull request calogica#21 from calogica/refactor/expect_column_v…

…alues_to_be_within_n_moving_stdevs

Refactor expect_column_values_to_be_within_n_moving_stdevs

Merge pull request calogica#20 from calogica/refactor/uniqueness-tests

Refactor single & multi-column uniqueness tests

Merge pull request calogica#19 from calogica/add/expect_column_distin…

…ct_count_to_equal

Adds expect_column_distinct_count_** tests