add new intro paragraph, update data tables with sept25 data
remove resource to who bar charts, added table
adjusted top table to include health requirements, added health requirement data
point about to WHO Ebola page
rearrange header links, add link to who.int, add link to who ebola page
Merge pull request #4 from who-ocr/update-sept27

Update sept27
Merge pull request #5 from who-ocr/master

Merge changes to go live on gh-pages