Feature request: add file.Glob function

[artemklevtsov]

Hi,

It would be useful to read.Glob function in addition to file.Walk.

Example:

$ tree /tmp/foo
/tmp/foo
├── one.yaml
└── two.yaml
├── three.yaml
├── four.json
└── five.json

$ gomplate -i '{{ range file.Glob "/tmp/*.yaml" }}{{.}}{{"\n"}}{{end}}'
/tmp/one.yaml
/tmp/two.yaml
/tmp/three.yaml

[hairyhenderson]

Thanks for the suggestion @artemklevtsov, this seems like a reasonable addition.