[add] item & category models
[add] http client setup
Merge branch 'develop' of github.com:nsuinteger/trailfinder-ios into develop

# By Subhransu Behera
# Via Subhransu Behera
* 'develop' of github.com:nsuinteger/trailfinder-ios:
  changed initial storyboard

Conflicts:
	Source/Rentlet/Rentlet.xcodeproj/project.pbxproj