Added sbt script, minor changes.

Author: lossyrob

build.sbt

@@ -7,5 +7,5 @@ scalaVersion := "2.10.3"
 libraryDependencies ++= Seq(
   "io.spray" % "spray-routing" % "1.2.0",
   "io.spray" % "spray-can" % "1.2.0",
-  "com.azavea.geotrellis" %% "geotrellis" % "0.9.0-RC4"
-)
+  "com.azavea.geotrellis" %% "geotrellis" % "0.9.0"
+)