When rendering as HTML, texts in the curly braces should not be hyphenated for line wrapping.

[Hong]

Sometimes people style their web pages with hyphens, which hyphenating words for line wrapping, just like what pybtex.org does. However, words within curly braces should not be breakable for line wrapping -- that's an important point to curly brace abbreviations such as NASA, SARS.

[Andrey Golovizin]

HTML backend: wrap {braced groups} in <span class="bibtex-protected">

Fixes #85.

→ <<cset 8609f9bebc25>>

[Andrey Golovizin]

Words within curly braces are now rendered ad <span class="bibtex-protected">NASA</span>, so it is possible to disable the hyphenation via CSS.