added missing support for package-level rendition metadata
Merge branch 'develop' into feature/packageRenditionMetadata
added check for nil package, in which case the local value is fetched.
Fix what looks like a typo.
Merge pull request #134 from readium/feature/packageRenditionMetadata

Feature/package rendition metadata
typo!
Buffer was not initialised with correct size in filter_chain_byte_stream!
Added log message in case of XML parsing error
Merge branch 'develop' into feature/epub3Bindings

Conflicts:
	ePub3/ePub/filter_chain_byte_stream.cpp