Merge pull request #61 from mateidavid/gcc4_8

allow backward compatibility with gcc 4.8

Merge pull request #54 from svigerske/master

eliminate use of std::make_unique, remove zstr_make_unique_polyfill.h

So that codebase does not mix GPL and MIT licenses, but is still C++11-compatible

Merge pull request #49 from JGI-Bioinformatics/master

Flush close on destroy, CMake and buff_size
Added CMakeLists.txt and included buff_size in the constructor of the i/ofstream classes
Including a close on the underlying I/ofstream on destruction

Merge pull request #9 from sandsmark/master

make it possible to specify window bits, and possible to specify parameters from zstr::istream/ostream.
several bug fixes and platform compatibility things.

Merge pull request #11 from johnkeeping/catch-by-ref

Catch exceptions by const reference

make strerror static

ignore sync error in ostreambuf destructor

added travis