wildcard content type and method

Wildcard content types are currently not supported. Would be nice to have this feature to not be limited by a list - sometimes this is necessary. For example if you are trying to catch all possible requests and their content.

https://github.com/aws/chalice/blob/master/chalice/app.py#L47

Would this project consider merging a solution that would allow:
content_types=['*']

Also I'm not 100% sure there seems to some kind of support for methods with this syntax:
methods=['*']

But if I use it with the decorator I currently still get method not accepted error. Will have to dig deeper into this - this should also probably be supported?

Start in chalice/app.py around line 47 and trace how decorator content_types and methods are validated. Reproduce the reported method-not-accepted case with content_types=['*'] and methods=['*']; done means wildcard values are supported consistently where the issue requests them.

Written by the indexing model from the issue text.