[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
Merge pull request #420 from bjo3rnf/assetorderfix

[BUGFIX] Correct order of included assets
Merge pull request #418 from bjo3rnf/pdfthumb

[FEATURE] Add PDF thumbnail viewhelper
[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
Merge pull request #431 from cedricziel/pageLinkFix

[BUGFIX] LinkViewHelper should respect tag-content in translations
[FEATURE] Rootline view helper
Merge pull request #432 from hmspl/rootline

[FEATURE] Rootline view helper
[TASK] CGL compliance for content.render
Merge pull request #433 from hmspl/cgl

[TASK] CGL compliance for content.render
[TASK] Deprecating asset trim, closes #435
Merge pull request #441 from hmspl/asset_trim

[TASK] Deprecating asset trim, closes #435
[BUGFIX] Make media.size chainable
Merge pull request #442 from cedricziel/chainMediaSize

[BUGFIX] Make media.size chainable
[TASK] Add PHPCI build configuration and Build subdirectory