GuidesViewController, basic browse.
GuidesDetailViewController first steps.
Bugfix: GuideTaxa without photos were crashing.
Added GuideTaxonViewController.
Added search to GuideDetailViewController
Added name labels to GuideDetailViewController.
Added slide out side menu for guides.
Added tag filtering.
First step toward local guide downloads.
Delete guides that aren't downloaded and weren't just loaded.
Only show download option when NGZ info in XML.
More local guide downloads stuff.
Guide XML downloads should happen in the BG if already local.
Tried to prevent guides list from showing login prompt when not necessary.
Tried to ensure that bootstrap css is available offline.
Added attribution to guide taxon view.
Added photo viewer for guide photos and maps.
Added delay for guide searches.
Bumped image size on guide taxon pages.
Numerous small bugfixes, including
* Sources and Attribution should not show "Maps: " if no maps, etc.
* "Your Guides" is asking for login when not required
* selecting guide from search that hasn't previously been downloaded
  shows blank
* remove HTML from guide descriptions