Allow bundler to choose right build

[shrpne]

I have changed the direct import of bundled minified version to generic 'autonumeric'.

So bundlers like webpack will be able to choose the right version depends on the package.json fields: main, browser, module.
This can lead to smaller bundle size for ES6 environment.

Notes:

• dist/vue-autonumeric.js is not really changed, only variable naming was changed by webpack during build, if you want I can revert it
• There is a note in the webpack.base.js about the need of webpack alias for ES6 module setup, but it works fine for me without alias, maybe it is outdated now and was required only for older versions of webpack?

[agentschmitt]

• There is a note in the webpack.base.js about the need of webpack alias for ES6 module setup, but it works fine for me without alias, maybe it is outdated now and was required only for older versions of webpack?

Are you are building in a windows enviroment? It would work there cause OS is not case sensitive.
If you build in linux enviroment or when you use case-sensitive-paths-webpack-plugin (default in the vue-cli) it would still fail without alias i think.

[shrpne]

As I understand autonumeric already has a problem with case-sensitive systems and I don't try to solve it.
Here is some PRs trying to handle it #6 #30
If some of them will be merged then I will rebase my PR to align with them.