• added optional $config to MobileDetect constructor.
• added autoInitOfHttpHeaders configuration which is by default true. This enabled the old behavior from 3.x and 2.x that allows automatic detection of HTTP headers and User Agent from $_SERVER.
• refactored internal CloudFront related methods and the way setHttpHeaders work. It no longer falls back on $_SERVER. The method still calls setUserAgent in case HTTP_USER_AGENT and friends are present.
• added maximumUserAgentLength to the $config, by default the limit is 500.