Fix tests failing on Travis

This reverts commit adfa53f95a54f1ac6227ef0359aa9ffc79b7a5d1 and makes the tests pas.

The issue is not specific to Travis, the tests were failing on my Linux/OS X boxes as well. And that would be the reason:

```
% installed="something something
> IPy==1.2.3"
% eval "echo $installed | grep IPy=="
something something
% echo $?
1
% eval "echo \"$installed\" | grep IPy=="
IPy==1.2.3
% echo $?
0
%
% bash --version
GNU bash, version 3.2.51(1)-release (x86_64-apple-darwin13)
Copyright (C) 2007 Free Software Foundation, Inc.
% sh --version
GNU bash, version 3.2.51(1)-release (x86_64-apple-darwin13)
Copyright (C) 2007 Free Software Foundation, Inc.
```