Fix compiler errors related to Vault & Update Vault to 1.6 API version.

The Maven info has been updated and has been updated in the POM file to reflect the vaultapi readme page repository and dependency version.

pom.xml

@@ -101,7 +101,7 @@
         <dependency>
             <groupId>net.milkbowl.vault</groupId>
             <artifactId>VaultAPI</artifactId>
-            <version>1.5</version>
+            <version>1.6</version>
             <scope>provided</scope>
             <exclusions>
             	<exclusion>
@@ -320,7 +320,7 @@
     <repositories>
         <repository>
             <id>vault-repo</id>
-            <url>http://nexus.theyeticave.net/content/repositories/pub_releases</url>
+            <url>http://nexus.hc.to/content/repositories/pub_releases</url>
         </repository>
         <repository>
             <id>ess-repo</id>