fix in intro docs
Fixing Session\Store vs Session\SessionManager issue

Fixes an issue caused by the fix for this issue on laravel/framework:
https://github.com/laravel/framework/issues/2368
Merge pull request #353 from adamfairholm/master

Fixing Session\Store vs Session\SessionManager issue
version bump to 4.7.1 and changelog for #353 (Closes #351)
Merge pull request #354 from FrozenNode/dev

Merge 4.7.1 into master