initial commit
added testing dependencies
added initial brochure spec
added steps to access flat details iframe
added steps to access units for each block
added steps to parse all block and unit info
added db and model structures
storing parsed data into db
generalized loop for multiple estates and flat types
added Estate model and steps to parse flat supply
using Estate.total to resume from disruption, fixed interaction problem with repeated block numbers in same area
fixed issue with single quotes in xpath
storing the parsed data as seeds
replacing Block.estate with estate_id
added scaffold for units