Add Bibtex processing files to gitignore

Change-Id: I8220886365fb4e5d2269883f03d7cafa7bf2708e
diff --git a/.gitignore b/.gitignore
index 9ed28a8..3c82dfb 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,10 +1,16 @@
 .DS_Store
 output/
 
-# Tex files
+# Tex files
 *.aux
 *.fdb_latexmk
 *.fls
 *.log
 *.out
 *.synctex.gz
+*.bbl
+*.blg
+
+# Bibtex-specific files
+*.bcf
+*.run.xml