Add luv as a third party dependency

Luv is a simple lua binding to libuv, which is now used by neovim lua client.
The bundled luv installation a bit different from other dependencies in that it
is installed two times:

- The "BuildLuv.cmake" script downloads and installs a static version of luv
  using its normal cmake build script. This static version will be used later.
- Luv default rockspec is replaced with the alternate under the "rockspecs"
  directory(the alternate rockspec plays nicer with neovim build system)
- The alternate rockspec is used to build/install the lua module and make it
  available to lua scripts.

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