ExUnitFixtures v0.3.0

This release adds FixtureModules. These are modules of fixtures that can be imported into tests or other fixture modules.

ExUnitFixtures will automatically import any fixture modules that it finds named fixtures.exs, and these will automatically be used by any tests level with or further down in the directory heirarchy. For example, we can now create this directory heirarchy:

tests/
    fixtures.exs
        defmodule GlobalFixtures do
          use ExUnitFixtures.FixtureModule

          deffixture db do
            create_db_conn()
          end
        end

    model_tests/
        fixtures.exs
            defmodule ModelFixtures do
              use ExUnitFixtures.FixtureModule

              deffixture user(db) do
                user = %User{name: "Graeme"}
                insert(db, user)
                user
              end
            end

        user_tests.exs
            defmodule UserTests do
              use ExUnitFixtures

              @tag fixtures: [:user]
              test "user has name", context do
                assert context.user.name == "Graeme"
              end