v0.1.7

Luna v0.1.7

Diff since v0.1.6

Merged pull requests:

• fix FreeGrid window (#300) (@chrisbrahms)
• Add nonlinear refractive index for MgF2 (#302) (@chrisbrahms)
• Add more flexibility for chirped mirrors (#303) (@chrisbrahms)
• increment version (#304) (@chrisbrahms)