Update: libktorrent 1.3.1

[Schamschula (Marius Schamschula)]

libktorrent has been updated to version 1.3.1. Notes:

1) homepage and master_sites have been updated.

2) There is a build issue with the current version of boost (1.57.0) which affects libktorrent builds (old and new versions): I had to manually edit /opt/local/include/boost/type_traits/detail/has_binary_operator.hpp according to to an answer found in

​http://stackoverflow.com/questions/15455178/qt4-cgal-parse-error-at-boost-join

i.e. add #ifndef Q_MOC_RUN to the top and #endif to the bottom of the header file.