Cannot remove an environment user with upper case characters

[Cheryl Jennings]

When creating the document for an environment user, the username is stored as all lower case. However, when the query is done to remove a user from the collection, the user tag passed in is not converted to lower case.

It appears the new methods EnvironmentsForUser and IsSystemAdministrator will also have this problem.

[Cheryl Jennings (cherylj)]

EnvironmentsForUser and IsSystemAdministrator don't have this problem. RemoveEnvironmentUser does because it is querying on the ID (which is the lower case version of the name).

[Cheryl Jennings (cherylj)]

Review request: http://reviews.vapour.ws/r/1985/