Added jrnl formula

Hi there, 

I added a new formula for [jrnl](http://maebert.github.io/jrnl/) following your `contributing` guidelines.
It installs on a mavericks host and runs the test correctly.

If possible, please merge.

Thanks for your work.
Which line you mean?

If I remove line 16 I get `BuildError: Failed executing: python setup.py install --prefix=/usr/local/Cellar/jrnl/1.9.5/libexec`

If I remove line 22 I get: 
``` bash
brew test jrnl
Testing jrnl
==> /usr/local/Cellar/jrnl/1.9.5/bin/jrnl -h
2014-09-30 11:19:27 +0100

/usr/local/Cellar/jrnl/1.9.5/bin/jrnl
-h

Error: jrnl: failed
```