add iconic taxa images
add explore model layer

a little different than in the Explore Prototype cuz i'm backporting
this to restkit 0.10.3
add explore-specific extensions
add explore views
building (but non-functional) explore integration

to be functional, will need to convert from RESTKit 0.20 to 0.10
move explore xcode group
add explore tab to storyboard
validator for positional accuracy
update observation fetching to use restkit 0.10
search for people to use restkit 0.10
validator for woeid, which can be blank
correct comment
a few more restkit 0.20 -> 0.10 conversions
use restkit 0.10 to fetch observation comments & ids
clean up restkit object loader calls
adjust mapping provider to match ExploreTaxon class
show taxon details use restkit 0.10
clean up object loader delegate in explore obs controller
update add comment/id to use inat oauth implementation
remove AFOauth2Client