CB-2420 [Windows8] honor fileKey and param options. This closes #15
[Windows8] upload uses the provided fileName or the actual fileName
Update index.md

Simply add the values for the constants.
Merge branch 'master' of https://git-wip-us.apache.org/repos/asf/cordova-plugin-file-transfer
Merge branch 'master' of ssh://github.com/ldeluca/cordova-plugin-file-transfer into CB-6773cordova-plugin-file-transfer