Remove a Copy Headers section (following on from earlier cset to change
these to use Copy Files).
Upgrade to new Xcode settings.  This enables a whole bunch more warnings.
Add a new constructor that takes a port.

This adds initWithHostName:portNumber:apiPath:customHeaderFields: and
has initWithHostName:apiPath:customHeaderFields: call it in turn.

This allows callers to specify host and port in one step.
Merge branch 'init-with-port'
Make it possible to prevent the addition of the Accept-Language header.

This adds shouldSendAcceptLanguageHeader to MKNetworkEngine and
MKNetworkOperation (the value on Operation is set by Engine when the
Operation is created).

This defaults to YES, preserving the existing behavior.

If set to NO, then no Accepts-Language header is added to the request.
For API calls that are not language-dependent, this can save a significant
fraction of the request size, since the NSLocale preferredLanguages list
can be long.
Merge branch 'shouldSendAcceptLanguageHeader'