added IntellJ meta files to .gitignore
added processing of the 'categories.txt' file into the product documents
changed back to process the whole list, instead of just the first 30
renamed some variables, and disabled 'break on thumbprint match'
renamed 'body' to 'doc', and added sticking the brand (potentially truncated) to the category list
 * added category for the brand
 * deduced existence of a 'limited' category from the brand and title
 * canonicalized categories
 * fixed indentation