Fix #1053 - Preserve whitespace in release notes 

Current code preserve spaces in release notes.

Without this change, it makes displaying release notes difficult. For example, https://nuget.org/packages/Glimpse/1.3.0 should look more like http://getglimpse.com/version/install?Glimpse=1.2.0..1.3.0.

Also can we please have the line breaks as br's instead of p's. Again the formatting looks kinda sucky if we are trying to do anything more than a block of text with release notes.

<!---
@huboard:{"order":666.5}
-->