Fix the bug with the disappeared pointer
more efficient huffman tree encoding, and fixed memory leak
Fix build system.
Move include dir spec to Makefile
Fix misc cppcheck warnings.
Makefile: Consolidate list of default targets
Install soname symlink properly instead of copying
Makefile: Move -lm to end of libzopfli.so compile

Fixes build on bfd.
Add make test.
add .travis.yml
disable travis ./configure
fix make test
adjust travis.yml
Update LodePNG