video thumbnail adapter: changed availability detection

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@3086 1f8fe7d8-47f0-464c-8d0a-336f4953ab05
video thumbnail adapter: changed availability detection

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@3087 1f8fe7d8-47f0-464c-8d0a-336f4953ab05
ffmpeg detection changed PATH order

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@3088 1f8fe7d8-47f0-464c-8d0a-336f4953ab05
asset document thumbnails: added ghostscript adapter and made it the default

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@3089 1f8fe7d8-47f0-464c-8d0a-336f4953ab05
added ghostscript path to system settings / asset section

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@3090 1f8fe7d8-47f0-464c-8d0a-336f4953ab05
build auto version ...

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@3091 1f8fe7d8-47f0-464c-8d0a-336f4953ab05