Added name parameter for output file

[gustav-dahl]

I have added an name parameter to be able to specify an name for the output fil.

[biesbjerg]

Thank you for the PR!

Rather than introduce another argument I'd prefer if the output arg was smarter (preferably in a backwards compatible way):

1. No output arg provided: save to ./template.FORMAT (current behavior)

2. Output arg is provided with value '/dir' and dir exists: save to /dir/template.FORMAT (current behavior)

3. Output arg is a provided with value 'en.json' (and en.json is not a dir): save to ./en.json

4. Output arg is provided with value '/dir/file.txt': Save to /dir/file.txt

What do you think?

[biesbjerg]

Added in this commit: 031890c

[gustav-dahl]

That sounds like a great alternative. Thank you for the fast feed back and an awesome project!