Emails are forceed to lower case, but search is case sensitive

All emails stored in user.com are forcibly converted to lower case (which I don't agree with, but fine).

However, the API email search is case-sensitive, meaning you cannot use the email the customer entered, without first converting it to lower case.

Suggested change:

1. According to best practices you should store emails as customer entered it, but all searches should be case-INsensitive.

If this is not possible:

2. Make email search in the API case insensitive, possibly with a optional boolean flag if you feel this might break things.