Implement internal default no-op annotations

[grosscol]

Given an spek and data, but no annotations.r, the application should;

• add performers in data
• not add any attributes to performers.

The default internal annotation strategy should be no-op. Simply return a list of performers.

[grosscol]

Resolution was to handle the case when no annotation functions were found in the annotations file given. This makes bitstomach a passthrough.

Since annotations is the core functionality of bitstomach, not providing them emits an error.

Addressed by #33