brewnit: introducing hops.nit: all hop-related material

Signed-off-by: Lucas Bajolet <r4pass@hotmail.com>
brewnit/hops: Added some tests for a few functionalities of Hop.

Signed-off-by: Lucas Bajolet <r4pass@hotmail.com>
brewnit: Added new units for Volume.

Signed-off-by: Lucas Bajolet <r4pass@hotmail.com>
brewnit: Added lbs to weight

Signed-off-by: Lucas Bajolet <r4pass@hotmail.com>
brewnit: Added test for units.

Signed-off-by: Lucas Bajolet <r4pass@hotmail.com>
brewnit: Gravity units added to tests and unit

Signed-off-by: Lucas Bajolet <r4pass@hotmail.com>
brewnit: Added mash components to brewnit

Signed-off-by: Lucas Bajolet <r4pass@hotmail.com>
brewnit: Added recipe and base test.

Signed-off-by: Lucas Bajolet <r4pass@hotmail.com>