Merge pull request #172 from nwin/master

add benchmark
Merge pull request #173 from nwin/master

Implemented all deprecated numeric traits and moved them to the traits m...
Merge pull request #174 from nwin/master

Adhere to rust naming conventions
Merge pull request #175 from nwin/master

Remove MutableRefImage
Do not enable if_let explicitly

The feature has been added to the language, enabling it explicitly now
issues a warning.
Merge pull request #176 from ruud-v-a/if_let

Do not enable if_let explicitly