Added babel/no-invalid-this

[mathieumg]

This is to help closes #12. The implementation is really rudimentary, whenever inside a class property it considers all this to be valid. I tried to think about it a bit, is there any scenario where it isn't the case?

All files are taken from ESLint since this proposal is still only stage 2, but might make its way into ESLint if it ever reaches stage 4 (hopefully!):

• https://github.com/eslint/eslint/blob/ce590e28ee4146ab04974c8f768b169538059585/lib/ast-utils.js
• https://github.com/eslint/eslint/blob/ce590e28ee4146ab04974c8f768b169538059585/lib/rules/no-invalid-this.js
• https://github.com/eslint/eslint/blob/ce590e28ee4146ab04974c8f768b169538059585/tests/lib/rules/no-invalid-this.js

Build fails on 0.10 and 0.12 because of #71 (comment)

I also added the lodash.clonedeep module to the dev dependencies since it was used in the original tests. Let me know if there is anything.

[mathieumg]

@jquense @hzoo

[jquense]

can you adjust to pass CI?

[mathieumg]

You mean remove 0.10 and 0.12 from the CI? See #71 (comment)

[mathieumg]

@jquense ping

0.10 now out of maintenance and 0.12 to follow very soon, too.

[mathieumg]

Thanks! I imagine dropping 0.10/0.12 support will be done separately?