basic ui layout
ui fixes
numberpad first tests
add some more tests
Merge branch '3'

Conflicts:
	Converter.xcodeproj/project.pbxproj
	Converter.xcworkspace/xcshareddata/Converter.xccheckout
	Converter/Base.lproj/Main.storyboard
	Converter/ViewController.h
	Converter/ViewController.m
	Podfile
	Pods/Pods.xcodeproj/project.pbxproj