Add cache options for prevent underscore in URLs

[vmalyk]

Solves #34

[gsomoza]

Thanks for your PR! Could you please explain what you mean by "underscore in URLs"? If you're still interested in this change please feel free to update your fork with the latest changes to the module.

[vmalyk]

@gsomoza ,

Conflicts are resolved.
"underscore in URLs" - it's about parameter "_ " It's added by jQuery for AJAX requests for non-cached requests and handled by option for$.get, $.ajax - cache (by default , it's false) and It's described in discussion #34. For resolving I updated IAS library to 2.3.1 - It's provides to set up options on load event and set cache option to true.

[gsomoza]

Oh right, sorry I was reading this in my email and forgot to check the PR description. It's clear, thanks for the fix! I'll merge and release now.