Improved epub:switch test in document 0100

Reading systems may ignore content in unrecognised elements, thus
excluding the 'FAIL' text in the switch-010 test. Changing the
epub:case branch to use a <p> element instead means that only the
behaviour of processing the epub:switch statement is tested.
Merge pull request #50 from rhdunn/master

Improved epub:switch test in document 0100
refine some test samples
Add Ruby scripts for font file obfuscation
Merge pull request #51 from aadamowski/master

Add Ruby scripts for font file obfuscation
added missing meta viewport width height for MO #220 (Readium fails to compute dimensions without them, maybe EPUB-Check should report an error in rendition-layout pre-paginated mode?)
Changed 'jp' to 'ja' for test document 130 (EGLS)
fixed svg-430
Merge pull request #55 from vincent-gros/master

fixed svg-430
Fix incorrect observer id for the "show" button
Mute/unmute epub:triggers : more specific evaluation criteria
Merge pull request #56 from julien-c/master

`Epub:trigger`s: Fix incorrect observer id
fixed conflicts after merge with master branch