Download readme and xml for patches

Download readme and xml metadata of the file.
Evaluate if readme is html, and rename to .html, otherwise assume is text and name it as .txt

example files generated:
p19491900_R12.ADO.C_R12_GENERIC.html
p19491900_R12.ADO.C_R12_GENERIC.xml
p19491900_R12.ADO.C_R12_GENERIC.zip
p6880880_101000_Linux-x86-64.txt
p6880880_101000_Linux-x86-64.xml
p6880880_101000_Linux-x86-64.zip

So on the server where patches are left, the readme became available:

![image](https://cloud.githubusercontent.com/assets/1255709/4907390/94b258f0-6461-11e4-9d66-409aed846f84.png)

The XML files I do believe can be then used into Enterprise Manager, not tested yet, but they download fine.