First release

Create API to retrieve version number

- Added VERSION macro to Makefile, set to 0x010000 (1.0.0).
- Updated libvinput compilation flags to include VERSION=$(VERSION) for
  all platforms.
- Modified the installation script to remove existing versions of
  libvinput.so and create a symbolic link with the new version number.
- Included VInput_version() function in libvinput.h to return the
  current library version.

Signed-off-by: Slendi <slendi@socopon.com>