gradle.rb generation is broken under Windows

[ysb33r]

JRubyGenerateGradleRbIntegrationSpec fails under Windows (Appveyor):

com.github.jrubygradle.JRubyGenerateGradleRbIntegrationSpec > Generate gradle.rb FAILED 
    java.util.regex.PatternSyntaxException: Unknown character property name {r} near index 21
    export GEM_HOME="C:\projects\jruby-gradle-plugin\build\tmp\integrationTest\root\jggris\gems"
                         ^
        at java.util.regex.Pattern.error(Pattern.java:1924)
        at java.util.regex.Pattern.charPropertyNodeFor(Pattern.java:2730)
        at java.util.regex.Pattern.family(Pattern.java:2685)
        at java.util.regex.Pattern.sequence(Pattern.java:2043)
        at java.util.regex.Pattern.expr(Pattern.java:1964)
        at java.util.regex.Pattern.compile(Pattern.java:1665)
        at java.util.regex.Pattern.<init>(Pattern.java:1337)
        at java.util.regex.Pattern.compile(Pattern.java:1022)
        at com.github.jrubygradle.JRubyGenerateGradleRbIntegrationSpec.Generate gradle.rb(JRubyGenerateGradleRbIntegrationSpec.groovy:39)

[rtyler]

These specs are working now, closing this out