add ignorePath option to cli command

[shota-kizawa]

I think many people want to ignore files by using .ignore file.

For example,
add

**/*.vue

then

vue-i18n-locale message squeeze --target=./ --output=./message.json --ignorePath=./.ignore-i18n

I made a pull request, so I want you to check my pull request.

[kazupon]

I've just released out v1.1.0
Thanks!