fix(CLI): Better output if missing version of react-native-windows
fix(CLI): Better output if missing version of react-native-windows

RNPM currently fails ambiguously if there is no version of react-native-windows that aligns with the latest version of react-native. This change better detects when that is the case and outputs a more explicit error message.

Fixes #1106

lbochenek/react-native-windows,lbochenek/react-native-windows,lbochenek/react-native-windows,lbochenek/react-native-windows