Update beta configs

* Bootstrap beta from the newly minted stable release
* Update the Cargo to match the 1.16.0 release

Author: alexcrichton

src/ci/run.sh

@@ -29,7 +29,7 @@ RUST_CONFIGURE_ARGS="$RUST_CONFIGURE_ARGS --disable-manage-submodules"
 # FIXME: need a scheme for changing this `nightly` value to `beta` and `stable`
 #        either automatically or manually.
 if [ "$DEPLOY" != "" ]; then
-  RUST_CONFIGURE_ARGS="$RUST_CONFIGURE_ARGS --release-channel=nightly"
+  RUST_CONFIGURE_ARGS="$RUST_CONFIGURE_ARGS --release-channel=beta"
   RUST_CONFIGURE_ARGS="$RUST_CONFIGURE_ARGS --enable-llvm-static-stdcpp"
 
   if [ "$NO_LLVM_ASSERTIONS" = "1" ]; then

src/stage0.txt

@@ -12,5 +12,5 @@
 # tarball for a stable release you'll likely see `1.x.0-$date` where `1.x.0` was
 # released on `$date`
 
-rustc: beta-2016-12-20
-cargo: bfee18f73287687c543bda8c35e4e33808792715
+rustc: 1.15.0-2017-01-31
+cargo: 6e0c18cccc8b0c06fba8a8d76486f81a792fb420