Initial checkin of klib support.

The libraries exist in two incarnations:
    packed foo.klib and unpacked foo/ .
The compiler when given '-library foo' expects to find either
a foo.klib file and unpack it, or an already unpacked foo/ directory.

The stdlib is always unpacked in dist/klib .

The semantics of -o has changed slightly.
It now accepts '-o foo' and the compiler
either produces foo.kexe or foo.klib .

buildSrc/src/main/groovy/org/jetbrains/kotlin/KonanTest.groovy

@@ -117,7 +117,7 @@ abstract class KonanTest extends JavaExec {
     }
 
     String buildExePath() {
-        def exeName = project.file(source).name.replace(".kt", ".kt.exe")
+        def exeName = project.file(source).name.replace(".kt", "")
         return "$outputDirectory/$exeName"
     }
 
@@ -206,9 +206,10 @@ fun handleExceptionContinuation(x: (Throwable) -> Unit): Continuation<Any?> = ob
     @TaskAction
     void executeTest() {
         createOutputDirectory()
-        def exe = buildExePath()
+        def program = buildExePath()
+        def exe = "${program}.kexe"
 
-        compileTest(buildCompileList(), exe)
+        compileTest(buildCompileList(), program)
 
         if (!run) {
             println "to be executed manually: $exe"