fix too long classpaths in script(bat/bash).

[nazoking]

the maximum length of the string that you can use at the command prompt is 8191 characters. http://support.microsoft.com/kb/830473/en-us

Create manifest.jar it contains Class-Path manifest.
java classpath option need only a manifest.jar.

java -Xjvmopt1 -Xjvmopt2 -cp org.name-version-artifactClassifier.jar:scala-liblary.jar:aaaaaa.jar:bbbbbb:jar:cccc.jar:......:xxxxxx.jar mainClass arg1 arg2

↓

java -Xjvmopt1 -Xjvmopt2 -cp org.name-version-artifactClassifier-manifest.jar mainClass arg1 arg2

This patch affects both the batch script and bash script.

fix #72

[muuki88]

Code looks good. However I would like to extract this function into a separate AutoPlugin.
We will have some of the jar-packaging plugins soon. Like assembly, fat-jar, classpath-jar.

Ideally the scriptClasspath settings would be the only setting this plugin sets. It should require the UniversalPlugin, which adds the scriptClasspath. You can create a new package for this in com/typesafe/sbt/packager/jar

[muuki88]

@nazoking you need more guidance here?

[nazoking]

Does this commit meets your request?

[muuki88]

This looks awesome! I will take care of a linux test. If you have time you can provide some docs in another commit.

[jroper]

Nice!