Fixed minor build warnings for ePub3.xcodeproj
Removed warning-causing dylib linking for ePub3-iOS target
Merge pull request #60 from NYPL/feature/ePub3-iOS-build-fix

Fixes for various warnings in ePub3-iOS target
URL percent escape for unicode characters in filepath
fixes #90 (rendition metadata)
Media Overlays bugfix for EPUBs that do not use a OEBPS or EPUB (or whatever) "root" content folder: the ReadiumSDK is slightly odd in that it returns absolute paths with prefix '/' (instead of say: "OEBPS/html/chapter1.xhtml", it returns "/html/chapter1.xhtml")
Initial implementation of Readium.framework
Cleaned up shell scripts and removed redundant build step
Minor framework build script cleanup