v0.5.2

Krotov v0.5.2

Diff since v0.5.1

Closed issues:

• optimize mutates guess pulses (#28)

Merged pull requests:

• Allow to catch Ctrl+C in interactive optimization (#27) (@goerz)
• Add test for optimization with pulses (#29) (@goerz)
• Set atexit in @optimize_or_load (#30) (@goerz)