Pill: Introduce pill{} extension to set extended Pill configuration

Also introduce the flavor concept which allows to specify what part of Kotlin project should be imported.

libraries/tools/kotlin-gradle-plugin-api/build.gradle

@@ -1,5 +1,6 @@
 apply plugin: 'kotlin'
 apply plugin: 'maven'
+apply plugin: 'jps-compatible'
 
 configureJvmProject(project)
 configurePublishing(project)
@@ -8,6 +9,10 @@ repositories {
     mavenLocal()
 }
 
+pill {
+    variant = "FULL"
+}
+
 dependencies {
     compile project(':kotlin-stdlib')