fix json serialization (Closes: #943)
add fancy difflib based diff to determine failures on travis
Fixes #660: Hack to fix double-free (simply setting features to NULL).
Merge pull request #1047 from tklein23/master

Small hack to fix double-free in StreamingSparseFeatures
lua52 fix
Merge pull request #1056 from crunchiness/master

Fixed interface for Lua 5.2
Merge remote-tracking branch 'upstream/master' into develop