Declare aliases for the major top-level targets

This avoids needing to type ":" in front of the name to build.
Eventually I can move the eclipse targets down into a different
area and hide them from the top level file.

Change-Id: I9781099348cbe969bfd9c1f38711c37e1b92d3e2
diff --git a/.buckconfig b/.buckconfig
index 164b9d4..f14c855 100644
--- a/.buckconfig
+++ b/.buckconfig
@@ -1,3 +1,9 @@
+[alias]
+  gerrit = //:gerrit
+  release = //:release
+  download = //:download
+  eclipse = //:eclipse
+
 [buildfile]
   includes = //lib/DEFS