1153 Add content_guessing optional param to imports API
Adding content_guessing parameter within import process
Make ContentGuesser::minimum_entropy modifiable by config
1153 Improved countries query
1153 Move column name to a constant and fix test
1153 Add job as optional param of ContentGuesser

Add the job as an optional param of ContentGuesser to be able to log
info from the ContentGuesser.
1153 Add content_guessing optional param to sync API
Added content_guessing param for url and services imports
t push origin Merge branch '1153-guessing-param-for-import-api' of github.com:CartoDB/cartodb into 1153-guessing-param-for-import-api
1153 Add content_guessing to js model so it's not filtered in the post
1153 Actually use the content_guessing param in syncs
1153 Check for different columns with index

Check different columns with index for sampling and give up with an
exception if no suitable one is found. Namely: ogc_fid, gid, cartodb_id
1153 Fix typo in ContentGuesser
1153 Fix silly bug in ContentGuesser.id_column (with tests)
1153 Small style modification suggested by kartones
1153 Handle possible missing id column exception
1153 Track performance metrics
1153 Fix typo from code review
Merge pull request #1197 from CartoDB/1153-guessing-param-for-import-api

1153 Add content_guessing optional param to imports API