Update .gitignore

allowing shared libs
preparing branch based release
Merge remote-tracking branch 'github/master'

Conflicts:
	README.md
added screenshots for prt4cmd examples
Update README.md
Merge branch 'master' of devtopia.esri.com:simo6772/esri-cityengine-sdk
Delete myhouse30.png
Delete myhouse62.png
Update README.md
Update README.md
Update README.md
Update README.md
Update README.md
Update README.md
Merge branch 'master' of github.com:ArcGIS/esri-cityengine-sdk
Update README.md
Update README.md
Update README.md
Update README.md
empty master branch (not used at the moment)