Remove signing configuration.

This breaks CI, and the way the plugin works means you need your
password stored in a config file, which I ain't doing.

Will manually sign releases for now, I guess.

build.gradle

@@ -5,7 +5,6 @@ subprojects {
 
     apply plugin: 'maven-publish'
     apply plugin: 'java'
-    apply plugin: 'signing'
 
     sourceSets {
         main {
@@ -88,10 +87,6 @@ subprojects {
         }
     }
 
-    signing {
-        sign configurations.archives
-    }
-
     sourceCompatibility = 1.7
     targetCompatibility = 1.7