[fix] Emulator preloading, added library version

This is a fix for emulator preloading, now works without any issue, at least on my side :

```
> sbt
Loading project definition from /Users/fx/Documents/Projects/Lunar/project
[info] Set current project to Lunar (in build file:/Users/fx/Documents/Projects/Lunar/)

> android:preload-emulator Galaxy_Nexus_HAXM
[info] Starting emulator with read-write system
[info] This may take a while...
Warning: No DNS servers found
HAX is working and emulator runs in fast virt mode
[info] Installing scala-library.2.10.0.jar
[info] Setting permissions for scala-library.2.10.0.jar
[success] Total time: 31 s, completed Mar 15, 2013 10:52:20 PM

> android:emulator-start Galaxy_Nexus_HAXM
[success] Total time: 0 s, completed Mar 15, 2013 10:52:31 PM

> android:start-emulator
[info] Wrote /Users/fx/Documents/Projects/Lunar/target/scala-2.10/src_managed/main/scala/com/github/fxthomas/lunar/TR.scala
[info] Skipping Proguard
[info] Packaging /Users/fx/Documents/Projects/Lunar/target/lunar-0.1.apk
[success] Total time: 4 s, completed Mar 15, 2013 10:53:35 PM
```