Merge branch 'release-0.5.2' into develop
update Ubuntu version and improve the text
improve visualization of supported versions
Now doc is installed
COPYING file install with in documentation file.
remove maybe confuse of doc dir name
improve documentation
add a soname to the library
Merge branch 'master' of https://github.com/natir/libes into natir-master
Merge branch 'natir-master' into develop
bump version to 0.5.3
update CONTRIBUTING.md in order to tell people to make pull request against develop, not master
add an entry in the ChangeLog for 0.5.3
add an entry in the roadmap (for future 0.6 version)
Merge branch 'release-0.5.3'