v4.5.0

(NEW) Added TIME reasoner with 24 Allen-based temporal inference rules (#54)
(NEW) Added TIME validator with 19 Allen-based temporal analysis rules (#55)
(MISC) Code cleanups and general performance improvements:

• Asynchronous SKOS validator (9d24caa)
• Cache imported ontologies (3cf9138, 7756bfb)
• Cache relevant individuals in SKOS and TIME validators (bfce307, 7bacd30)
• Cache relevant individuals in TIME reasoner (7a90e5a)
• Faster init of TIMEOrdinalReferenceSystem (f8eb9af, fa39bce)