Merge pull request #1 from sunithamisra/master

Basic access code and templates
Removed unused templates
Merge pull request #2 from sunithamisra/master

Second round of commits
Merge pull request #3 from sunithamisra/master

Directory navigation works
Moved old imgaccess test
Updated image_browse to use path chaining
Added temp dimac logo
Updated flask templates
Removed old logo
Added new logo
Updated templates and pushed in Sunitha's file download mods
Updated readme
Further README udpates
Minor file download code fix
Modified the mtime (displayed on the browser) to isoformat