initial work, only PoC for now

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+rpminfo
+=======
+
+Experimental wrapper for librpm
+
+For now, only expose
+
+	int rpmvercmp(string evr1, string evr2);
+
+
+Mostly a PoC build for fun because of
+
+https://bugzilla.redhat.com/1537981
+performance issue: dnf repomanage is really slow
+
+
+Some benchmark results (find 15 old RPMs among 5000)
+
+# DNF on Fedora
+
+    $ time dnf repomanage --old --keep 5 .
+    ...
+    real	0m15,971s
+
+# YUM on RHEL / CentOS
+
+    $ time repomanage --old --keep 5 .
+    ...
+    real	0m5.519s
+
+# PHP script
+
+    $ time php repomanage.php --old --keep 5 .
+    ...
+    real	0m0,634s
+