Fix encoding issues with rss

Some records were not being displayed in firefox.  Send proper headers and use htmlspecialcars on text from the database.
Don't use htmlspecialchars() in dbStringToHTML()

This causes with problems because it is used in more than just the XML output.  htmlspecialchars() should be specific to rss output.
Move escaping to savvy
Merge pull request #89 from mfairchild365/issue-36

Fix validation issues with rss output