Add new build tool.

bibliogra.py requires Python 2, which is a pain to deal with.  This
commit adds a Go tool that compiles CensorBib from BibTeX to HTML.  The
tool does the bare minimum and is quite strict in the BibTeX format it
expects.

src/vendor/github.com/nickng/bibtex/docs.go

@@ -0,0 +1,23 @@
+// Package bibtex is a bibtex parser written in Go.
+//
+// The package contains a simple parser and data structure to represent bibtex
+// records.
+//
+// # Supported syntax
+//
+// The basic syntax is:
+//
+//	@BIBTYPE{IDENT,
+//	    key1 = word,
+//	    key2 = "quoted",
+//	    key3 = {quoted},
+//	}
+//
+// where BIBTYPE is the type of document (e.g. inproceedings, article, etc.)
+// and IDENT is a string identifier.
+//
+// The bibtex format is not standardised, this parser follows the descriptions
+// found in the link below. If there are any problems, please file any issues
+// with a minimal working example at the GitHub repository.
+// http://maverick.inria.fr/~Xavier.Decoret/resources/xdkbibtex/bibtex_summary.html
+package bibtex // import "github.com/nickng/bibtex"