Greg Williams

Fixes ConcurrentModificationException mentioned in Issue #47

1

This crash was our app's most common crash prior to making this change. ``` Fatal Exception: java.util.ConcurrentModificationException at java.util.HashMap$HashIterator.nextEntry(HashMap.java:851) at java.util.HashMap$KeyIterator.next(HashMap.java:885) at com.franmontiel.persistentcookiejar.cache.SetCookieCache$SetCookieCacheIterator.next(SetCookieCache.java:67) at com.franmontiel.persistentcookiejar.cache.SetCookieCache$SetCookieCacheIterator.next(SetCookieCache.java:52) ``` After this change, we've...