0.6.17 many fixes, see description

bump to 0.6.17
* last update for the old path
* updated docs
* fixed src typos
* bumped xhook to 1.3.0
* removed version from dist directory (closes jpillora#124) - global find/replace all affected links
* fixed event prop deprecation warning
* xhook bug fixes (closes jpillora#120)
* user controlled xhook.addWithCredentials (closes jpillora#125 @DveMac)
* fixed timeout checks (closes jpillora#118 @rcambrj)
* added log,warn,timeout hooks (closes jpillora#104)
* added xhr abort on (iframe) timeout (fixes jpillora#102)