Added gitignore file

Author: Ian Dunn

.gitignore

@@ -0,0 +1,18 @@
+# Built by autotools
+Makefile
+Makefile.in
+/aclocal.m4
+/configure
+config.log
+config.status
+src/config.h
+autom4te.cache
+
+# Generated during build process
+*.o
+src/aris
+src/.deps
+
+# Generated Documentation
+doc/*/aris/*.html
+doc/aris.info