v0.1.17

ITensors v0.1.17

Diff since v0.1.16

Merged pull requests:

• Fix documentation for exp(::ITensors, ...) function (#454) (@mtfishman)
• Try to fix documentation building for tags (#455) (@mtfishman)
• Doc build tags (#456) (@mtfishman)
• ITensor iteration and other miscellaneous ITensor and MPS/MPO functionality (#457) (@mtfishman)