added -R option to less command to output raw control characters on osx

Without this option less asks you to open it even though it is a binary file. To avoid that and have it displayed correctly you need to add the `-R` option on mac (maybe even on other unix systems)


*BEFORE*

![bildschirmfoto 2013-11-23 um 16 27 44](https://f.cloud.github.com/assets/718617/1606683/de568126-5453-11e3-831a-d98706278666.png)

*AFTER*

![bildschirmfoto 2013-11-23 um 16 27 19](https://f.cloud.github.com/assets/718617/1606685/ec8c331c-5453-11e3-87b9-8699781e8265.png)