New Release 0.8

[inkydragon]

diff: 7ac490d...master

New feature

• SHA3 xof shake128 and shake256 (SHA3 xof shake128 and shake256  #92, shake128,shake256: fixed typo in export declarations #93, Issue #94 (shake128 test coverage): fixed bug in padding for shake, added testcases for full code coverage #95)
  shake_128, shake_256
• SHA-512: impl SHA-512/224, SHA-512/256 (SHA-512: impl SHA-512/224, SHA-512/256 #98)
  SHA-512: impl SHA-512/224, SHA-512/256