Add 'AeroGear-Crypto' check dependency on aerogear-ios Xcode template

Since Xcode template can generate a generic 'Podfile', an option e.g. 'Enable Crypto' can be added to add the 'AeroGear-Crypto' dependency only.

(Implicitly when you add 'Enable Pipeline' support and the AeroGear library is added, implicitly Crypto is added too, but won't harm for Crypto to be added independently since it can be supported)