* In Shared, openURL and fetchItem now return an Either, for
better error handling. (API change.)
* Better error message when fetching a URL fails with
`--self-contained`.
* EPUB writer: If resource not found, skip it, as in Docx writer.
* Closes#916.
before treating as a filename. This fixes `--self-contained`
when used with CSS files that include web fonts using the
method described here:
http://paulirish.com/2009/bulletproof-font-face-implementation-syntax/
Examples from reveal.js themes:
"../../lib/font/league_gothic-webfont.eot?#iefix"
"../../lib/font/league_gothic-webfont.svg#LeagueGothicRegular"
Closes#739.
* Shared now exports fetchItem (instead of getItem) and openURL
* fetchItem has different parameters than getItem and includes
some logic formerly in the ODT and Docx writers
* getItem still used in SelfContained
* Added `embed_data_files` flag. (not yet used)
* Shared no longer exports `findDataFile`.
* `readDataFile` now returns a strict bytestring.
* Shared now exports `readDataFileUTF8` which returns a string like
the old `readDataFile`.
* Rewrote modules to use new data file functions and to avoid
using functions from Paths_pandoc directly.
* Depend on text.
* Expose Text.Pandoc.UTF8.
* Text.Pandoc.UTF8 now exports toString, fromString,
toStringLazy, fromStringLazy.
* These are used instead of the old utf8-string functions.
