datastore: Improving confusing pagination sample on README.
datastore: Don't clear the offset value, API supports cases where both offset and start cursor is set.
Merge pull request #93 from rakyll/pagination

datastore: Avoid clearing offset when start cursor is set
datastore: Add support for end cursors.
Merge pull request #94 from rakyll/endcursor

datastore: Add support for end cursors
add editorconfig & jshint.
re-tweaks.