make prices work with floats; make cancel go backwards

fix issue #30 and issue #34
reformatting code again
fixed app crash after submit
Merge pull request #39 from farmproducers/fixSubmitProductsForNewMaster

fixed app crash after submit
enrich readme
add changelog
fix labels
minor fix
more additions
Update README.md
view products
improve product listing
remove broken productlisting class
fix formatting v5
missed line