Merge tag '0.2' into develop

0.2 has now lots of new stuff:

- a new image has been added;
- beer info has been included;
- Fira Sans is now the font;
- a new line has been added for the specification of recipe variations.
put preamble in a separate file
add support for american english and german before brazilian portuguese
put the choice of parameters in the preamble
add a new example using an american pale ale and an alligator :)
allow selection of image y position for images with funny aspect ratios (landscape-like)
Merge branch 'release/0.3'