Add .gitignore for C++ libtrace artifacts (#15)

Author: thestr4ng3r

libtrace/.gitignore

@@ -0,0 +1,24 @@
+/.aclocal.out
+/.autoconf.out
+/.autoheader.out
+/.automake.out
+Makefile
+Makefile.in
+aclocal.m4
+/autom4te.cache/
+/compile
+/config.*
+/configure
+*~
+/depcomp
+install-sh
+missing
+.deps/
+stamp-h?
+*.o
+*.a
+src/config.h
+src/config.h.in
+src/frame.piqi.*
+src/readtrace
+src/copytrace