fix feature inits
TFFeature and TFFeatureCollection
remove removeFeatureAtIndex from FeatureCollection
changes from review
Merge pull request #10 from jyaganeh/master

Feature and FeatureCollection
Merge remote-tracking branch 'upstream/master'

Conflicts:
	Terraformer.xcodeproj/project.pbxproj
	Terraformer/TFFeature.h
	Terraformer/TFFeature.m