Upgrade com.twitter.common#jar-tool to 0.1.5

This picks up a fix for memory leaks under nailgun's
repeated invocations of main.

Testing Done:
$ PANTS_DEV=1 ./pants goal jar src/{java,scala}:: -ldebug
...
21:01:06 00:00   [jar]
21:01:06 00:00     [jar]
21:01:06 00:00       [jar-create].DEBUG] Executing: /opt/jdk1.7.0/bin/java -Divy.cache.dir=/home/jsirois/.ivy2/twitter-commons -Xmx1g -XX:MaxPermSize=256m -Dsun.io.useCanonCaches=false -cp /home/jsirois/.ivy2/twitter-commons/org.apache.ivy/ivy/jars/ivy-2.3.0.jar org.apache.ivy.Main -settings /home/jsirois/dev/3rdparty/jsirois-pantsbuild-pants/build-support/ivy/ivysettings.xml -ivy /home/jsirois/dev/3rdparty/jsirois-pantsbuild-pants/.pants.d/ivy/4147dbb500c708344acc417e09c84556032b610c.da39a3ee5e6b#4c4fdc2a0cf8/ivy.xml -confs default -cachepath /home/jsirois/dev/3rdparty/jsirois-pantsbuild-pants/.pants.d/ivy/4147dbb500c708344acc417e09c84556032b610c.da39a3ee5e6b#4c4fdc2a0cf8/classpath.raw.tmp
.DEBUG] No ng server found with fingerprint 7ae73b6e87959b5c95b27fd71e95487367a07863, spawning...
DEBUG] Executing: /opt/jdk1.7.0/bin/java -Xmx64M -Dpants.buildroot=/home/jsirois/dev/3rdparty/jsirois-pantsbuild-pants -Dpants.nailgun.owner=/home/jsirois/dev/3rdparty/jsirois-pantsbuild-pants/.pants.d/ng/jar-tool -Dpants.nailgun.fingerprint=7ae73b6e87959b5c95b27fd71e95487367a07863 -cp /home/jsirois/dev/3rdparty/jsirois-pantsbuild-pants/.pants.d/ivy/jars/com.martiansoftware/nailgun-server/jars/nailgun-server-0.9.1.jar:/home/jsirois/.ivy2/twitter-commons/com.twitter.common/jar-tool/jars/jar-tool-0.1.5.jar:/home/jsirois/.ivy2/twitter-commons/com.twitter.common/args/jars/args-0.2.13.jar:/home/jsirois/.ivy2/twitter-commons/com.twitter.common/args-apt/jars/args-apt-0.1.17.jar:/home/jsirois/.ivy2/twitter-commons/com.twitter.common/args-core/jars/args-core-0.1.18.jar:/home/jsirois/.ivy2/twitter-commons/com.google.guava/guava/bundles/guava-16.0.1.jar:/home/jsirois/.ivy2/twitter-commons/com.google.code.findbugs/jsr305/jars/jsr305-2.0.1.jar:/home/jsirois/.ivy2/twitter-commons/commons-lang/commons-lang/jars/commons-lang-2.6.jar:/home/jsirois/.ivy2/twitter-commons/com.twitter.common/base/jars/base-0.0.95.jar:/home/jsirois/.ivy2/twitter-commons/com.twitter.common/quantity/jars/quantity-0.0.79.jar:/home/jsirois/.ivy2/twitter-commons/com.twitter.common/collections/jars/collections-0.0.82.jar:/home/jsirois/.ivy2/twitter-commons/com.twitter.common/util-system-mocks/jars/util-system-mocks-0.0.81.jar:/home/jsirois/.ivy2/twitter-commons/com.twitter.common/net-util/jars/net-util-0.0.84.jar:/home/jsirois/.ivy2/twitter-commons/commons-codec/commons-codec/jars/commons-codec-1.6.jar:/home/jsirois/.ivy2/twitter-commons/com.twitter.common/io/jars/io-0.0.56.jar:/home/jsirois/.ivy2/twitter-commons/commons-io/commons-io/jars/commons-io-2.1.jar:/home/jsirois/.ivy2/twitter-commons/com.twitter.common/logging/jars/logging-0.0.62.jar:/home/jsirois/.ivy2/twitter-commons/joda-time/joda-time/jars/joda-time-2.3.jar:/home/jsirois/.ivy2/twitter-commons/org.joda/joda-convert/jars/joda-convert-1.5.jar com.martiansoftware.nailgun.NGServer :0
DEBUG] Spawned ng server with fingerprint 7ae73b6e87959b5c95b27fd71e95487367a07863 @ 27168
DEBUG] Detected ng server up on port 59408
DEBUG] Found ng server with fingerprint 7ae73b6e87959b5c95b27fd71e95487367a07863 @ pid:27168 port:59408
DEBUG] Connected to ng server with fingerprint 7ae73b6e87959b5c95b27fd71e95487367a07863 pid: 27168 @ port: 59408
...

Bugs closed: 169

Reviewed at https://rbcommons.com/s/twitter/r/433/