Fix quoting in CI definition

Quote the command introduced in
6a9992b9ea35eb67a9dab1a9a5a218c0a57c2efc.
Fix #1239: Don't assume in ExtJSEnv that VM supports require
Merge pull request #1250 from gzm0/improve-partest

Fix quoting in CI definition
Merge pull request #1251 from gzm0/no-require

Fix #1239: Don't assume in ExtJSEnv that VM supports require
Fix #1252: Missing asInstanceOf's/unbox'es in scalajsenv.js.

Only one was really a danger, i.e., the result of charCodeAt()
in charSequenceCharAt() with an out-of-bounds index. The others,
being calls to methods of primitive data types, are hardly a
problem, because the implementations cannot return wrong results.
(Of course, they could be overwritten by an evil user, so it's
better to check them.)
Merge pull request #1253 from sjrd/issue-1252

Fix #1252: Missing asInstanceOf's/unbox'es in scalajsenv.js.
Fix #1247: Adapt getClass for primitives to Scala.js subtyping

Note that the checkfile override for run/t6318_primitives.check for
Scala 2.11.0 and 2.11.1 has been wrongly introduced in
efe48f93214f376d99e6409fe94acba0af45d620. This commit both fixes the
mistake and adapts them for the change.
Merge pull request #1254 from gzm0/getClass-of-number

Fix #1247: Adapt getClass for primitives to Scala.js subtyping
Fix #1241: Add Future based API to AsyncJSEnv
Merge pull request #1255 from gzm0/async-future

Fix #1241: Add Future based API to AsyncJSEnv
Fix #1261: Forward-port additional test for #1252

Originates from: c63d49981b4e7b86e13c4888b3bf680e27bcfdaf which is a
backport commit to 0.5.x that adds an additional test case.
Merge pull request #1264 from gzm0/backport-test

Fix #1261: Forward-port additional test for #1252
Fix #1266: Proper connection closing on Node.js ComJSEnv
Merge pull request #1267 from gzm0/fix-nodejs-race

Fix #1266: Proper connection closing on Node.js ComJSEnv
Fix #1181: Support supplementary chars in RuntimeString.
Merge pull request #1270 from sjrd/fix-supplem-chars-in-runtimestring

Fix #1181: Support supplementary chars in RuntimeString.
Fix #974: Implement java.util.UUID.

Except UUID.nameUUIDFromBytes, because that relies on computing
an MD5 or SHA-1 hash.
Fix #1236: Implement java.io.PrintWriter.
Merge pull request #1273 from sjrd/printwriter

Fix #1236: Implement java.io.PrintWriter.
Implement part of java.nio.{Byte,Char}Buffer.

These are required to implement Charset encoders and decoders.