remove -XX:MaxPermSize=128M; it doesn't exist in Java 8

Author: SethTisue

README.md

@@ -178,7 +178,7 @@ We typically alias `build/quick/bin/scalac -d sandbox` to `qsc` and `build/quick
 Note: on most machines this requires more heap than is allocate by default.  You can adjust the parameters with ANT_OPTS. Example command line:
 
 ```
-ANT_OPTS = "-Xms512M -Xmx2048M -Xss1M -XX:MaxPermSize=128M" ant docs
+ANT_OPTS = "-Xms512M -Xmx2048M -Xss1M" ant docs
 ```
 
   - `ant dist` builds a distribution in 'dists/latest'.

test/partest

@@ -117,8 +117,7 @@ fi
 
 # last arg wins, so if JAVA_OPTS already contains -Xmx or -Xms the
 # supplied argument will be used.
-# At this writing it is reported test/partest --all requires 108m permgen.
-JAVA_OPTS="-Xmx1024M -Xms64M -XX:MaxPermSize=128M $JAVA_OPTS"
+JAVA_OPTS="-Xmx1024M -Xms64M $JAVA_OPTS"
 
 # the ant task doesn't supply any options by default,
 # so don't do that here either -- note that you may want to pass -optimise