Merge pull request #11 from xaqq/master

Check return code from std::remove.
Add mingw build and run script for bench example
Merge pull request #12 from mintyc/add_mingw_bench

Add mingw build and run script for bench example. Thanks @mintyc
Fixed rotate bug
Update README.md
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Update file_helper.h

Removed unneeded include
Update file_helper.h
async_sink to use queue of pointers of log_msgs - faster than moving..
Merge branch 'master' of https://github.com/gabime/spdlog
async_sink to use queue of pointers of log_msgs - faster than moving..
Update README.md
Update README.md
Update README.md
Update README.md
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