0.8

CHANGES:

• add linkat operations. (@LucaSeri @talex5 #105, reviewed by @avsm)

• add fsync and fdatasync operations. (@avsm #103, reviewed by @talex5)

• add docstrings for many more functions (@avsm #100, reviewed by @talex5 @patricoferris)

• use lintcstubs to generate C prototypes and fix bugs (@talex5 #104)