Delete old build files before building and add missing __init__.py (E…

…xabel#37)

Include a search service with utility search methods (Exabel#36)

Add init docstring to data classes (Exabel#35)

Support `create_tag` in upsert_time_series (Exabel#34)

Expose create_library_signal and create_tag (Exabel#33)

Return None instead of raising error for NotFound (Exabel#31)

Update protobufs with flags for creating library signals and tags (Ex…

…abel#29)

Support JSON requests over HTTP (Exabel#28)

Update protobufs (Exabel#27)

Support providing root_certificates for TLS connections (Exabel#26)