Add mirage as dependency and add YYYY-mm-dd'T'HH:MM:SS.sss'Z' support to datetime formatting

[kulpster85]

Fix Usability issues:

1. add mirage as dependency (to setup.cfg when installing to ensure all the packages are installed)
2. add robustness to datetime formatting (i.e: support ISO formatting)

[kulpster85]

I have a fix for this and will create a pull request