v0.6.8

Gaius v0.6.8

Diff since v0.6.7

Closed issues:

• Analyzing matrix-matrix multiplication performance degradation in "more balanced" branch (#85)

Merged pull requests:

• Two-phase recursion and even more balanced DAG (#88) (@tkf)
• Refactoring: Move block_size to Threading type (#89) (@tkf)
• Updates for !(StaticInt<:Integer) (#92) (@chriselrod)
• bump version (#93) (@MasonProtter)