Merge pull request #44 from mtola/master

first version of MeppQt4CGALRenderEngine (only with 'hello world' render...) - but still problem with visualizator Register in MeppQt4Controller
Gharial now works with qt4 or qt5
update : Gharial now works with qt4 or qt5
BaseDecorator.hxx : written with Ricardo
Merge pull request #46 from mtola/master

update : Gharial now works with qt4 or qt5
Merge pull request #45 from ruribe/master

Disconnect observer and observable templates
fix Observer and Observable warnings with clang
Merge pull request #49 from ruribe/master

Gharial update
Merge branch 'master' of github.com:MEPP-team/Gharial
Resolve LINK error windows
Resolve LINK error windows (part 2)
Merge pull request #50 from vvidal/master

Gharial now ok under windows and macos (test just now), so,
fix cmake (xerces)