Fixes

• Added cleanUp() method in FpdiTrait and StreamReader to close open file handles when they are not used anymore (#70).

Features

• Added support for handling FlateDecode streams that uses CRC32 checksum.
• Added support for indirect references in /Length values of stream dictionaries.
• Added support for reading streams with an invalid /Length value.

Tweaks

• Use fully-qualified function calls.
• Fixed wording in various DocBlocks.