Updated Sample Project

[kabirkhan]

Hi the sample was asking for the a LuisSubscriptionID. However, the API now requires a key from an azure deployment of a Cognitive Services LUIS API. I changed this wording to make it more clear to future developers.

Also, I updated the sample to use Android support 24.2.0, gradle 2.14.1 and to compile for SDK version 24. Everything else still works the same in the sample, it is now just easier to use.

[msftclas]

Hi @kabirkhan, I'm your friendly neighborhood Microsoft Pull Request Bot (You can call me MSBOT). Thanks for your contribution!

In order for us to evaluate and accept your PR, we ask that you sign a contribution license agreement. It's all electronic and will take just minutes. I promise there's no faxing. https://cla.microsoft.com.

TTYL, MSBOT;

[msftclas]

@kabirkhan, Thanks for signing the contribution license agreement so quickly! Actual humans will now validate the agreement and then evaluate the PR.

Thanks, MSBOT;