replace spork with zeus

guard always send that tests had failed. this is a known issue
https://github.com/burke/zeus/issues/198
https://github.com/guard/guard-rspec/issues/134
fix clean up attachments after rspec tests

zeus or spring still doesn't pick new directories for
attachments.
switch from zeus to spring
mock requests to elastic search
clean unused gems
disable tire for non elastic search based tests
add quick search via elastic search and tire
filter search results by type, price, floor size and bedrooms
Merge branch 'feature/search' into develop

* feature/search:
  filter search results by type, price, floor size and bedrooms
  add quick search via elastic search and tire
  disable tire for non elastic search based tests
  clean unused gems
  mock requests to elastic search
  switch from zeus to spring
  fix clean up attachments after rspec tests
  replace spork with zeus