smart_stringencoders.cpp: RNS-1137, Implement smart string decoder that decodes two-character hex encodings with the prefix % or \x.
modules/tests/ts_all.rb: Conditionally include ruby tests that require MODP (string encoders) and the related modules.
smart_stringencoders.cpp: Adding %25HH (where HH are two arbirary hex encoded characters) to the decoder.

%252e, for instance, is a typical Microsoft double encoded '.' %character.
RNS-1268 trafficserver fix to prevent possible hang when processing zero-length but non-null response.
ts_filter.c: Downgrade notice to debug, resolving a FIXME. RNS-1184
CHANGES: Added info for 0.11.2.