Build kotlin-reflect.jar in build.xml and for Maven

Reflection will be distributed in a separate jar and not in kotlin-runtime.jar
for two primary reasons:
- Reflection implementation at the moment takes almost 2Mb
- Separate libraries for separate features is a technique encouraged by Maven,
  and it's inconvenient to make it different in the compiler distribution

libraries/pom.xml

@@ -45,6 +45,7 @@
         <asm.version>3.3.1</asm.version>
         <dart.name>dart-r3300</dart.name>
         <guava.version>11.0.2</guava.version>
+        <protobuf.version>2.5.0</protobuf.version>
         <junit-version>4.11</junit-version>
         <kotlin-maven-plugin.version>0.2.3.8</kotlin-maven-plugin.version>
         <kotlin-dist>${project-root}/dist</kotlin-dist>