Initial release
Here's the initial release of libepoxy, tested on Linux to not regress the piglit GL testsuite when converting it to using epoxy, and tested a few revisions ago on OS X as well. Win32/64 testing has been limited to the (very small) tests in the epoxy tree.
The plan is that the ABI is stable at this point and won't need SO version bumps. The only known upcoming ABI change is GL_ALL_ATTRIB_BITS changing based on Khronos's bug resolution (but then, this is an issue that all users of GL face, if so). There are basically no consumers of this API, and the change will be in a serious corner case where the GL specs contradict each other, so I expect this to affect exactly nobody except for piglit users.
As far as other known issues, this release paves the way for a maximum-performance win32 implementation by using function pointers, but doesn't yet implement it. mingw-built (and wine32-tested) binaries will be attached to the release, but I don't actually do any development on windows. Hopefully someone interested in the platform can take this on.