Expose (and tie) ChakraCore options like --v8-options

[choikwa]

Showing which options that could be passed to ChakraCore would be nice for debugging and customizing purposes.

$ ~/node-chakracore/Release/node.exe --v8-options
Options:
--use_strict (enforce strict mode)
type: bool default: false
--expose_gc (expose gc extension)
type: bool default: false
--harmony (Ignored in node running with chakracore)
--debug (Ignored in node running with chakracore)
--stack-size (Ignored in node running with chakracore)

• Version: v6.0.0-pre
• Platform: Win8.1 64bit
• Subsystem: optional. if known - please specify affected core module name

[jianchun]

@choikwa ChakraCore does not accept customizing options (at least yet). The output you posted are exactly what's available now and are implemented by the "shim" code in this repo.