I had forgotten that I needed to change the value of BUILD_DIR
in several different places.
Added comments warning future editors about this as well as filing
issue #5007 to track fixing this properly.
Despite being misconfigured and therefore failing, the typescript
and metadata test scripts were exiting with status 0, indicating
successful completion. These have been fixed so they should fail
on any error, including misconfiguration.
* Modify scripts/gulpfiles/typings.js to write typings to BUILD_DIR.
* Modify tests/scripts/compile_typings.sh to check compilability of
resulting output from BUILD_DIR.
* Rename checkin script to checkin:built, add a checkin:typings script
to do the same for .d.ts files, and a new checkin script to do both.
* Have recompile run checkin:typings.
