Added function to escape regular expression chars

[sorleone]

In the case of a binary filename containing characters that have a special meaning inside regular expressions, the installation/uninstallation fails.

Source for the solution:

https://stackoverflow.com/a/9310752

[int0h]

@sorleone I've made a fork (https://github.com/int0h/tabtab) of this repo with some changes. One of them is that I kinda merged your PR there. I put a credit for your work in readme.md. I hope you don't mind.