Fix NL replace (do not replace \r\n with two spaces)

[mvorisek]

previously \r\n was replaced by 2 spaces

[aik099]

Problem uncovered by this PR: we're not testing the normalization logic of the getText method, because:

• tests haven't failed after the change in this PR
• each of drivers does its own normalization (Zombie replaces any trailing whitespace with a single space; BrowserKit replaces \n with a single space and then replaces all trailing spaces with a single space; Selenium2 replace any line break with a single space)

Proposed next steps:

1. decide what we can test (not sure if \r could properly be tested in headless drivers)
2. add a new test and restart all driver repo builds to see which drivers actually comply
3. rebase this PR to see how the Selenium2 driver is doing

[mvorisek]

I have removed 4391f59 commit to not trim and keep this PR to bare minimum of the described problem.

[aik099]

@mvorisek , now I like the change.

@stof , what about testing considering that each driver is doing it differently?

[aik099]

Looks good. Merging. Thanks @mvorisek .