v0.9.4

CTDirect v0.9.4

Diff since v0.9.3

Merged pull requests:

• crude example of basic grid refinement (#158) (@PierreMartinon)
• print blas backend, moved problems/ up (#159) (@PierreMartinon)
• examples: beam (#160) (@PierreMartinon)
• bioreactor (#161) (@PierreMartinon)
• fuller (#162) (@PierreMartinon)
• add compat (#163) (@ocots)