Added title syntax for the thumbnail image

Text after the newly identified pipe is interpreted as title for the image.

Added support for pipe syntax in {{thumbnail>*}}

Close #5

Thumbnail presentation is now defined via max-width and min-width

divided code into 3 php files

added reference PDF file for dependency checks

checks for dependencies were moved to static methods (idea: Singleton)

added error handling and debug messages for failing dependencies

added tests for installed dependencies (ImageMagick, GhostView)

changed config setting thumb_width to thumb_max_dimension

image file suffixes are not compared to the supported format list within ImageMagick

we can now create thumbnails for jpg

extracted repetitive code to method thumb_needs_update

Added generic classes for conversion behavior

Generates a thumbnail from a pdf, now

Generates a thumbnail from a pdf, now, provided that ImageMagick, the php extension imagick, and Ghostscript are installed properly.

code cleaning

Will only update thumbnail files, when the original file has another modification date.

Configuration option 'link_to_media_file' added.

Configurable thumbnail path, configurable error message.

The path to look for thumbnails is now configurable, and in case no thumbnail could be found, an error message is displayed instead (configur

Configurable thumbnail path, configurable error message.

The path to look for thumbnails is now configurable, and in case no thumbnail could be found, an error message is displayed instead (configurable).

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nicer $data parsing

Streamlined code, renamed some variables

Thumbnail width is now configurable via key 'thumb_width'

Will output alternative title, now (filename)

Click on the thumbnail will load the file from media manager

Removed debug info

Initial commit