Bump image_optim_rails from 0.4.1 to 0.4.2
Bump image_optim_rails from 0.4.1 to 0.4.2

Bumps [image_optim_rails](https://github.com/toy/image_optim_rails) from 0.4.1 to 0.4.2.
- [Release notes](https://github.com/toy/image_optim_rails/releases)
- [Changelog](https://github.com/toy/image_optim_rails/blob/master/CHANGELOG.markdown)
- [Commits](https://github.com/toy/image_optim_rails/compare/v0.4.1...v0.4.2)
Coursemology/coursemology2,cysjonathan/coursemology2,Coursemology/coursemology2,Coursemology/coursemology2,Coursemology/coursemology2,cysjonathan/coursemology2,Coursemology/coursemology2,Coursemology/coursemology2,Coursemology/coursemology2,cysjonathan/coursemology2