Merge pull request #225 from bilgili/master

Versions are sorted correctly
PackageConfig searches for ABI-matching upstream dependencies.
If VERSION_ABI is not available, fallback to matching VERSION MAJOR+MINOR.
Fix Documentation Package URL for non-eyescale projects.
Merge pull request #227 from rdumusc/doc_package

Fix Documentation Package URL for non-eyescale projects.
Merge pull request #226 from rdumusc/packageconfig_abi

PackageConfig searches for ABI-matching upstream dependencies.
VERSION_ABI (SONAME) defaults to VERSION_MAJOR if not specified by user.
Merge pull request #228 from rdumusc/soname

Set default ABI_VERSION (SONAME) to 0 if unspecified.
Re-add generic tag target
Trying to get proper auto-update git externals
Merge branch 'master' of https://github.com/Eyescale/CMake
FindFFMPEG.cmake defines FFMPEG_INCLUDE_DIRS
Merge pull request #229 from rdumusc/ffmpeg

FindFFMPEG.cmake defines FFMPEG_INCLUDE_DIRS
Removed doc directories included in the 'git add' command run by doxygit
Otherwise a manual git rm or git add --all is needed.
Merge pull request #230 from hernando/master

Removed doc directories included in the 'git add' command run by doxygit
Make FindLibJpegTurbo work on Windows
Merge pull request #231 from tribal-tec/master

Make FindLibJpegTurbo work on Windows
Fixed FindPoppler.cmake
Use the paths reported by pkgconfig as hints.
Merge pull request #232 from hernando/master

Fixed FindPoppler.cmake
Remove obsolete DisplayCluster finder

Fixes also issues in downstream projects messing up the CMakeCache
with the version.h file content.
Add finder for zmq