added pgfplots compatibiliy

tikz/lda-gauss-1/lda-gauss-1.tex

@@ -3,6 +3,7 @@
 \usepackage[latin1]{inputenc}
 \usepackage{amsmath}
 \usepackage{pgfplots}
+\pgfplotsset{compat=1.10}
 \usepackage{tikz}
 \usetikzlibrary{arrows,positioning} 
 \usepackage{helvet}