Externalize asakusafw.version and hadoop.version

These properties sets on gradle.properties.
Changed asakusafw.version to specfy hadoop1.
Add projects for TestDrtiver inprocess examples.
Add example project for using Direct I/O Hive.
Bumps up default java version to 1.7.
Bumps up default Gradle version to 2.0.
Update libraries to recent versions (0.7.0)
Modified build script of example-directio-hive.

* Disabled inprocess by default.
* Auto attach libraries for Direct I/O Hive.