Revert "Replace URLEncode with non-deprecated version (assuming UTF-8). Catched and logged possible URLencode exception in Story.java. (Also fixed the StringBuilder)."

This reverts commit 90cf28f699949e956c7245b74c279afd68d48b51.
Don't use deprecated methods and underscore for member variables. ;)
Fixed typos. Return null instead of obvious null reference. Fixed some comments. Added // comment to a redundant null check (for the original author to review).