[#GRADLE-289] download wrapper zip to temporary file first

I faced the situation now more then 2 times that i canceled the first execution of the wrapper script and so the download of the wrapper dist.
Starting a second time gives me following exception:

Unzipping /Users/jz/.gradle/wrapper/dists/gradle-0.5-081029161231+0100-bin.zip to /Users/jz/.gradle/wrapper/dists
Exception in thread "main" java.util.zip.ZipException: error in opening zip file
        at java.util.zip.ZipFile.open(Native Method)
        at java.util.zip.ZipFile.<init>(ZipFile.java:203)
        at java.util.zip.ZipFile.<init>(ZipFile.java:234)
        at org.gradle.wrapper.Install.unzip(Install.java:94)
        at org.gradle.wrapper.Install.createDist(Install.java:63)
        at org.gradle.wrapper.Wrapper.execute(Wrapper.java:48)
        at org.gradle.wrapper.WrapperMain.main(WrapperMain.java:38)

I attached a patch which downloads the zip to a .part file first which should solve the problem.

[GRADLE-289] download wrapper zip to temporary file first Created: 30/Oct/08 Updated: 04/Jan/13 Resolved: 31/Oct/08
Status:	Resolved
Project:	Gradle
Affects Version/s:	0.4
Fix Version/s:	0.5

[GRADLE-289] download wrapper zip to temporary file first Created: 30/Oct/08 Updated: 04/Jan/13 Resolved: 31/Oct/08