Merge pull request yhirose#279 from yhirose/multipart

Content receiver support for multipart content (Fix yhirose#241)

Added upload example

Fixed PRI request problem

Update README

Fixed build error on Windows

Fixed problem caused by former changes

Merge pull request yhirose#193 from omaralvarez/master

Fix small CMake error when looking for the library

Merge pull request yhirose#172 from omaralvarez/master

CMake support