add minimum length to all string params in JSON objects
add character limit to photo and link in poi table
add max character limit
Revert "add character limit to photo and link in poi table"

This reverts commit 709ad5e4a61d913b58eea0c825e5521229c1c5aa.
leave char limit only for photo links for poi
Merge pull request #79 from Wikia/pin-cat-name-val

add minimum length to all string params in JSON objects