[Vala] New tiny helper for unit testing

[Yusuke Ishida <yusuke ishida gnl gmail com>]

Hi all,
I've create a new tiny helper 'vtth' for unit testing.
Please try it.

https://github.com/y-ishida/vtth

Features of vtth are as follows:
  - Only requires a file 'vtth.vala'.
  - Colored OK or NG are output at each assertion.
  - You can select actions at the assertion failed, wheter to abort or
continue the program.
  - The simple (one line) report which contained counts of OK, NG and
total of these is output.
  - Methods and parameters related the test case can be grouped into a class.

Regards,
Y.Ishida