[FEATURE] Add PDF thumbnail viewhelper
[TASK] Add "pdf" prefix to generated PDF thumbnails

This adds a dead-simple pdf prefix to the generated filename.
That way, one is able to simply delete all vhs-pdf-* files
from typo3temp without much hassle after fiddeling with ImageMagick
[BUGFIX] Correct order of included assets
[BUGFIX] LinkViewHelper should respect tag-content in translations

This fix postpones the title setting for sys_language_uid to the latest possible
point to overcome a bug.
Otherwise, the tag content wouldn't be taken into account when sys_language_uid != 0
[FEATURE] Rootline view helper
[TASK] CGL compliance for content.render
[TASK] Deprecating v:if.client.*
[FEATURE] Resources.image as with image info
[TASK] Deprecating asset trim, closes #435
[BUGFIX] Make media.size chainable
[TASK] Add PHPCI build configuration and Build subdirectory
[TASK] Upgrade Travis build

Happy now, Travis?
[TASK] Adjust failing base VH test case and test
[FEATURE] Uncache vh
[DOC] Updated uncache doch
[TER] 1.8.4
[BUGFIX] Fixed uncache
[FEATURE] Iterator.intersect view helper
[TASK] Remove outdated overview graphic
[TASK] Move code quality graphs to bottom