Merge pull request #6 from ryanackley/develop

Changes to get table of contents working in readium-js-viewer
resolving URL in progress
in progress
retreaving ibook properties in packaje document parser
Embedded fonts support for zipped EPUB and related changes:

* transitive stylesheet imports (@import rules) fetching logic
* parsing and fetching of URL resource references in fetched stylesheets
* switch to fetching stylesheets as text instead of binary blobs
* initial implementation of a resource caching submodule
* fixes to error handling in the epub-fetch module
* support for fonts deobfuscation in line with META-INF/encryption.xml
Bug fix: edding missing URI module dependency
Merge branch 'develop' into feature/embedded_fonts

Conflicts:
	epub-modules/epub-fetch/src/models/resource_fetcher.js
	epub-modules/epub/src/models/package_document_parser.js
Merge branch 'feature/embedded_fonts' into develop
rendition_leayout property set in package_document  bug fix
dependency update
Added a way to access the original toc url
Merge branch 'develop' of github.com:readium/readium-js into develop
Updated shared js