fixes driverSupport

In IE falsely reports IndexedDB as unavailable. Because in IE `typeof self.IDBKeyRange === 'object'`
Merge pull request #284 from Evgenus/patch-1

fixes driverSupport
Fixed documentation site: arguments for callbacks
Fix IE driver support bug
Merge pull request #286 from Evgenus/docs-callback-args-fix

Fixed documentation site: arguments for callbacks
Merge branch 'master' of github.com:mozilla/localForage into iterate

Conflicts:
	dist/localforage.min.js
	dist/localforage.nopromises.min.js
	site/localforage.min.js