Updates gradle to 3.0. Now that the check bug is fixed, removes the empty check tasks. (#101)

build.gradle

@@ -76,5 +76,5 @@ build.dependsOn wpiutilSourceZip
 apply from: 'publish.gradle'
 
 task wrapper(type: Wrapper) {
-    gradleVersion = '2.14'
+    gradleVersion = '3.0'
 }

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
-#Fri Jul 22 19:04:27 PDT 2016
+#Sat Aug 20 17:01:11 PDT 2016
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-2.14.1-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-3.0-bin.zip

ntcore.gradle

@@ -122,7 +122,6 @@ if (buildArm) {
 
 project(':native:ntcore') {
     apply plugin: 'cpp'
-    task check
 
     apply from: "${rootDir}/toolchains/native.gradle"
 

wpiutil.gradle

@@ -84,7 +84,6 @@ if (buildArm) {
 
 project(':native:wpiutil') {
     apply plugin: 'cpp'
-    task check
 
     apply from: "${rootDir}/toolchains/native.gradle"