Allow custom manifest in war/ subdirectory

[samspycher]

A custom manifest in war/META-INF/MANIFEST.MF caused the build to fail, because it was colliding with the automatically generated manifest file. Now a MANIFEST.MF is only automatically generated if no custom file exists.

[samspycher]

A note to the code: I don't have much experience at all on Scala, and couldn't figure out how to do the case distinction with the option variable more elegantly... perhaps you can improve this?

Also, I made the search for MANIFEST.MF case-insensitive, since the spec for jar seems to reserve other cases also (see http://docs.oracle.com/javase/6/docs/technotes/guides/jar/jar.html, search for 'case-insensitive'), and I am unsure if certain containers would possibly also accept different casing.

[dlecan]

I will add later some debug informations.

[dlecan]

Play2War v0.7.1 is out, including a fix for this issue.

[mdebusschere]

Is this valid for play 2.2.0 and play2-war-plugin 1.2-beta2 ?

Building on Windows 7 with Java 7.

Build fails due to conflict
[trace] Stack trace suppressed: run last *:war for the full output.
error java.util.zip.ZipException: duplicate entry: META-INF/MANIFEST.MF

Using custom web.xml files appears to work. Also, when I use a lowercase
filename manifest.mf, the WAR and ends up with TWO manifest.mf files.

[dlecan]

@mdebusschere Please report a separate issue, thank you.