Move to Java 7 (Maybe java 8 soon...)

* Also bump CH to v10, which uses Java 7
* Probably don't use this build, I have to test it first...

pom.xml

@@ -77,8 +77,8 @@
                 <artifactId>maven-compiler-plugin</artifactId>
                 <version>3.5.1</version>
                 <configuration>
-                    <source>1.8</source>
-                    <target>1.8</target>
+                    <source>1.7</source>
+                    <target>1.7</target>
                 </configuration>
             </plugin>
             <plugin>
@@ -298,7 +298,7 @@
         <dependency>
             <groupId>com.pneumaticraft.commandhandler</groupId>
             <artifactId>CommandHandler</artifactId>
-            <version>8</version>
+            <version>10</version>
             <type>jar</type>
             <scope>compile</scope>
         </dependency>