Update to latest Guava & snapshot samskivert.

For now I'm going to move everything to snapshot dependencies. After all the
dust settles, I'll publish new releases of everything and move back to stable
depends.

pom.xml

@@ -45,12 +45,12 @@
     <dependency>
       <groupId>com.samskivert</groupId>
       <artifactId>samskivert</artifactId>
-      <version>1.9</version>
+      <version>1.10-SNAPSHOT</version>
     </dependency>
     <dependency>
       <groupId>com.google.guava</groupId>
       <artifactId>guava</artifactId>
-      <version>18.0</version>
+      <version>33.4.0-jre</version>
     </dependency>
     <dependency>
       <groupId>javax.servlet</groupId>
@@ -67,8 +67,8 @@
         <artifactId>maven-compiler-plugin</artifactId>
         <version>3.1</version>
         <configuration>
-          <source>1.6</source>
-          <target>1.6</target>
+          <source>1.8</source>
+          <target>1.8</target>
           <fork>true</fork>
           <showDeprecation>true</showDeprecation>
           <showWarnings>true</showWarnings>