Implement getIpRemediation method

[julienloizelet]

In the spirit of what is done in the PHP library, we would like to have a method that returns the final remediation for a specific IP.

As a prerequisite, we need to implement a mechanism for caching decisions:

• : Store pulled decisions in cache #8

Then, for a given IP address, we need to examine all the decisions recorded for that IP address and return the final remediation ("ban", "captcha", "custom remediation" or "bypass" if there is no decision) using a certain order of priority.