Use of <pre> tags for logbook "log_description"

Hi! 

As a suggestion to better render the log entries, I have modified the current web-app to use html <pre> tags for display of the log_entry and changed to a proportional font. This allows ofor the use of formatted text in the log entries (see the attached screenshot from NSLS-II).

To get this to work properly I had to adjust the css templates for the pre tags. I don't know the full implications, but I couldn't find any other uses of pre tags in Olog. 

Please contact me with any questions!

Thanks, 
Stuart

![screen shot 2014-12-14 at 12 53 32 pm](https://cloud.githubusercontent.com/assets/1297941/5428387/3c626782-8390-11e4-820a-7790b825d0c3.png)