[java decompiler] updates Gradle project

.editorconfig

@@ -0,0 +1,6 @@
+[*]
+charset=utf-8
+end_of_line=lf
+insert_final_newline=false
+indent_style=space
+indent_size=2

.gitignore

@@ -1,2 +1,3 @@
+/.idea/
 /.gradle/
 /build/

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
-#Wed Sep 27 17:39:43 CEST 2017
+#Tue Nov 28 14:11:56 CET 2017
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.0-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.0-all.zip