Remove snapshots and switch to maven central

Resolves #15

complete/build.gradle

 buildscript {
     repositories {
-        maven { url "http://repo.spring.io/libs-snapshot" }
         mavenLocal()
+        mavenCentral()
     }
     dependencies {
         classpath("org.springframework.boot:spring-boot-gradle-plugin:1.0.2.RELEASE")
 
 repositories {
     mavenCentral()
-    maven { url "http://repo.spring.io/libs-snapshot" }
 }
 
 dependencies {

complete/pom.xml

         </plugins>
     </build>
 
-    <repositories>
-        <repository>
-            <id>spring-snapshots</id>
-            <url>http://repo.spring.io/libs-snapshot</url>
-            <snapshots><enabled>true</enabled></snapshots>
-        </repository>
-    </repositories>
-    <pluginRepositories>
-        <pluginRepository>
-            <id>spring-snapshots</id>
-            <url>http://repo.spring.io/libs-snapshot</url>
-            <snapshots><enabled>true</enabled></snapshots>
-        </pluginRepository>
-    </pluginRepositories>
 </project>

initial/build.gradle

 buildscript {
     repositories {
-        maven { url "http://repo.spring.io/libs-snapshot" }
         mavenLocal()
+        mavenCentral()
     }
     dependencies {
         classpath("org.springframework.boot:spring-boot-gradle-plugin:1.0.2.RELEASE")
 
 repositories {
     mavenCentral()
-    maven { url "http://repo.spring.io/libs-snapshot" }
 }
 
 dependencies {

initial/pom.xml

         </plugins>
     </build>
 
-    <repositories>
-        <repository>
-            <id>spring-snapshots</id>
-            <url>http://repo.spring.io/libs-snapshot</url>
-            <snapshots><enabled>true</enabled></snapshots>
-        </repository>
-    </repositories>
-    <pluginRepositories>
-        <pluginRepository>
-            <id>spring-snapshots</id>
-            <url>http://repo.spring.io/libs-snapshot</url>
-            <snapshots><enabled>true</enabled></snapshots>
-        </pluginRepository>
-    </pluginRepositories>
 </project>