@Override
    public <T> InjectorBuilder before(ExecutionBuilder<T> executionBuilder) {
        executions.add(requireNonNull(executionBuilder));
        return this;
    }
Default implementation of the {@link InjectorBuilder}-interface.

@author Emil Forslund
@since  1.2.0
common-parent/injector/src/main/java/com/speedment/common/injector/internal/InjectorBuilderImpl.java