After the hackday presentation.
Removed files in htdocs/tmp/ and added directory to .gitignore.
Removed commented out code and debugging.
Output files into htdocs directory.
Store list of datasets each URI is encountered in.
List all datasets that an entity is mentioned in.  Closes #1.
Correctly retrieve mapping of graph URI to label and dataset URI.  Closes #2
Truncate the labels as necessary.  Closes #5.
Correctly display 'in dataset' / 'in datasets' depending on number of datasets.
Sort datasets by URI and handle results with no datasets.
Improve styling of entity types.