Trim status image modal.

![screenshot-by-nimbus 36](https://cloud.githubusercontent.com/assets/193936/2940053/da06d30e-d96a-11e3-9e38-3670b7878577.png)

I also added one new small feature. Click to input selects whole text.

Closes https://github.com/travis-ci/travis-ci/issues/1900