In some cases `cp -P` outputs the path, so it is redirected to /dev/null now
Avoid printing "\n" at the end of the file name when resolving it
Use the declared variable since it is more explicit
Add b.unittest.run_successfuly?
Create a bang executable for testing bang apps

If `bangsh/bin` is in your `PATH` you can test
any project using `Bang.sh` just by executing:

```
$ bang test
```

For instance, if you want to execute Bang.sh tests:

```
$ cd bangsh/
$ ./bin/bang test
```
Passing arguments to the task call
Allow specifying which files should be run

For instance, `bin/bang test tests/file_test.sh`
Add some documentation for btask.test.run
Some minor refactoring
Add the `bang new` task
Implements `b.path.executable?` function
Add `new` task tests and improve existing code
Add `new` task documentations
Merge pull request #11 from bellthoven/bang-bin

 Add an executable file to help in the workflow