fetch error types from an URL

[lfoppiano]

We should place the error types in a single place and serve it via URL

[lfoppiano]

Implemented in

GET http://localhost:8080/error_types

{
  "composition_resolution": "Composition resolution", 
  "extraction": "Extraction", 
  "from_table": "From table", 
  "linking": "Linking", 
  "tc_classification": "Tc classification", 
  "value_resolution": "Value resolution"
}

[lfoppiano]

To update the error types:

db.tabular.update({error_type: "Linking"}, {"$set": {error_type: "linking"}}, {multi:1})
db.tabular.update({error_type: "Tc classification"}, {"$set": {error_type: "tc_classification"}}, {multi:1})
db.tabular.update({error_type: "Extraction"}, {"$set": {error_type: "extraction"}}, {multi:1})
db.tabular.update({error_type: "Composition resolution"}, {"$set": {error_type: "composition_resolution"}}, {multi:1})