Remove --no-color from arguments provided to git until redmine patches --no-color issue
Remove --no-color from arguments provided to git until redmine patches --no-color issue

The latest git version (2.14.1) removes the --no-color option which breaks existing redmine/git
support. We remove this option from the provided arguments until redmine fixes this,
presumably in redmine 3.4.3

```
root@d6debba8257d:/home/redmine/redmine# git --version --no-color
git version 2.14.1
root@d6debba8257d:/home/redmine/redmine# which git
/usr/local/bin/git
```

Fixes #305

otsuka512/docker-redmine,sameersbn/docker-redmine,otsuka512/docker-redmine,otsuka512/docker-redmine,sameersbn/docker-redmine,sameersbn/docker-redmine