v0.0.2

Minor release addressing a few issues:

• Indexing whole folder does not adhere to a particular format on every system. To mitigate this, index() and add_to_index() now return a dictionary mapping {doc_id: filename}. Metadata and user-defined doc ids will be supported in a future release.
• Adding support for non-CUDA accelerators for scoring, thanks to @velaia's work and @ManuelFay and @tonywu71's lighting-fast reactions.
• Fancy new examples thanks to @comhar