Removed installation instructions from README
Removed installation instructions from README

- BMSAnalyticsAPI should only be obtained by installing BMSCore since it is not a standalone framework
ibm-bluemix-mobile-services/bms-clientsdk-swift-analytics-api,ibm-bluemix-mobile-services/bms-clientsdk-swift-analytics-api,ibm-bluemix-mobile-services/bms-clientsdk-swift-analytics-api