TeX.gitignore - Updated to include ignores for intermediate sagetex and sympytex files

TeX.gitignore

@@ -77,3 +77,14 @@
 
 # xindy
 *.xdy
+
+# sagetex
+*.sagetex.sage
+*.sagetex.py
+*.sagetex.scmd
+
+# sympy
+*.sout
+*.sympy
+sympy-plots-for-*.tex/
+