Support for anaconda 5.1.0 and 5.2.0 (Closes #30)

[ppoilbarbe]

• Added support for anaconda 5.1.0 and 5.2.0 (I needed only 5.2.0)
• Corrected little bug when showing license file. Entering just one space is not enough since there is more than one page (depending on license file length and terminal size). In fact completely removed input file for installer, using options. This don't show license file and is more accurate.
• Lowered requirement for chef from 13 to 12 (there is not 13 specificity and it runs perfectly on chef client 12)
• Modified installation no do nothing at all if licence file is not accepted (no download, no directory creation).
• Used marker file for idempotent operation. Checking if directory exists may make anaconda not installed if an error occurs during previous installation try.

Related to issue #30 that I opened.

[thmttch]

Hey @ppoilbarbe, thanks for the PR, and PR notes! I'll try and take a look at it this weekend. At a glance it looks pretty good, except for the Chef 13 -> 12 change; I'm a little hesitant about that, and will need to look into it more.

[ppoilbarbe]

Hello,
In my society we did not switch to Chef client 13.
I tried every functions of recipes and had a look at code. I did not find any specificity.
Maybe did I miss something, it is up to you to tell me.
If 13 is needed, I will make another commit to revert back to 13.
Thanks.