Rename IFieldAlias and ITableAlias protocols names to IFieldCoerce and ITableCoerce.
Add docstrings to as-field and as-table functions.
Change field function patameters signature: remove named parameters.
Add docstring to table function on dsl namespace.
Code style improvements on set function on dsl namespace.
Fixup codestyle.
Refactor ddl dsl.
Update dependencies versions.

jOOQ: from 3.4.4 to 3.5.0
clojure.jdbc: 0.3.0 to 0.3.2