Prepare gradle config for building libs - bootstrap and runtime

Use external gradle plugin (1.1-M04) with compiler.jar from dist
Add empty build scripts for other projects that needs to be built with gradle

libraries/stdlib/build.gradle

@@ -0,0 +1,6 @@
+
+description = ''
+dependencies {
+  compile project(':kotlin-runtime')
+  testCompile project(':kotlin-test-parent:kotlin-test-junit')
+}

libraries/stdlib/common/build.gradle

@@ -0,0 +1,2 @@
+
+description = ''

libraries/stdlib/jre7/build.gradle

@@ -0,0 +1,6 @@
+
+description = ''
+dependencies {
+  compile project(':kotlin-stdlib')
+  testCompile project(':kotlin-test-parent:kotlin-test-junit')
+}

libraries/stdlib/jre8/build.gradle

@@ -0,0 +1,6 @@
+
+description = ''
+dependencies {
+  compile project(':kotlin-stdlib-jre7')
+  testCompile project(':kotlin-test-parent:kotlin-test-junit')
+}