Added text Google Earth KML with link
Changed name of method and set up array of navigation items rather than a string
uses getNavigationItems and wraps it's results in a section tag
Changed getNavigationMarkup to getNavigationItems
fixed test
Made URL for event KML configurable
removed commented code
Merge pull request #56 from jdbrown-USGS/EQH-2787

merged.
Updated _setFooterMarkup to use EventModulePage getDownloads
using _getProducts from EventModulePage.js and deleted getDownloads in favor of using the one in EventModulePage/_SetFooterMarkup
calls the parent _setFooterMarkup to get the download section
letting EventModulePage take care of the downloads list, and the _getproducts, left getProducts in place for dependencies in MomentTensorPage/Tablist
Added getDownloads, and _getProducts to centralize the download lists into the EventModulePage class,  and the footer section.
added product for download to _setFooterMarkup
added hasContent and productTypes for Download section of footer
removed getProducts override, and now convert an individual product to a tensor in getDetailContents, getSummaryContent still gets all the tensors, other changes to support downloads
Added code to produce a single product if code is defined, in order for Downloads to only get a single product in the details pages.
pulled downloads code from individual modules,  and out of setDownloadMarkup, and put into individual functions, setDownloadMarkup, loadDownloadMarkup, and getProducts
added caption to download title
added download classes