In Windows, some complex syntax {$...} isn't getting processed, causing errors. Concatenating the variables fixes this. Corrected variable name ('islandora_book_gs') as well.
ISLANDORA-42 Ensured comments were 80 characters or less.
ISLANDORA-42 Removed example code from comments.
ISLANDORA-42 Trigger a rebuild of Travis-CI (last build stalled). Comment edit.
ISLANDORA-42 Trigger a rebuild of Travis-CI: phpcpd failed to load. Comment edit.
ISLANDORA-42 Adjust for when temp data stored in dir, not memory.
Merge pull request #42 from slangerx/7.x

Windows-compatibility: Thumbnail generation / Undefined variable (Islandora Paged Content)