Imagegrains

- Adds installation via pip
- Adds file download
- Makes path handling robust
- Minor bug-fixes

**Full Changelog**: https://github.com/dmair1989/imagegrains/compare/v0.7.9...v0.8.0

First pre-release

What's Changed
* Packaging by guiwitz in https://github.com/dmair1989/imagegrains/pull/2
* dev_update by dmair1989 in https://github.com/dmair1989/imagegrains/pull/3
* Integrate dev updates by dmair1989 in https://github.com/dmair1989/imagegrains/pull/4

**Full Changelog**: https://github.com/dmair1989/imagegrains/commits/v0.7.9