Stop outputting full path of language file

I think that it is not necessary to dump full path of language file to .gitignore.
If you feel that is not bad, please merge this.

---

if execute `$ gibo Compass Espresso` before this change.
output is
```
### /Users/user_name/.gitignore-boilerplates/Compass.gitignore

.sass-cache


### /Users/user_name/.gitignore-boilerplates/Global/Espresso.gitignore

*.esproj
```

after this change output is
```
### .gitignore-boilerplates/Compass.gitignore

.sass-cache


### .gitignore-boilerplates/Global/Espresso.gitignore

*.esproj
```