Fix possessive errors and update for clarity
Fix possessive errors and update for clarity

[its v. it's](http://grammar.about.com/od/words/a/itsgloss.htm), [that v. which](http://www.quickanddirtytips.com/education/grammar/which-versus-that-0).
SaladFork/emberjs-website,balupton/ember-website,raycohen/website,ktornwall/website,kkenan/website,cllns/emberjs-website,zeppelin/emberjs-website,shearwater-intl/website,tmock12/website,jimmay5469/website,EricSchank/website,maxcal/website,cllns/emberjs-website,josemarluedke/ember-website,shearwater-intl/website,bmac/website,kkenan/website,quangv/website,kpfefferle/website,AaronSikes/website,ktornwall/website,wifelette/website,AgilionApps/website,SaladFork/emberjs-website,datajohnny/website,cyberkoi/website,kkenan/website,kpfefferle/website,raycohen/website,shearwater-intl/website,elwayman02/website,rwjblue/website,elwayman02/website,MinxianLi/ember,cyberkoi/website,Eric-Guo/website,elidupuis/website,EricSchank/website,josemarluedke/ember-website,elidupuis/website,greyhwndz/website,zeppelin/emberjs-website,MinxianLi/ember,datajohnny/website,AaronSikes/website,mrjavascript/website,duggiefresh/website,raycohen/website,workmanw/ember-website,elwayman02/website,MinxianLi/ember,maxcal/website,balupton/ember-website,jimmay5469/website,duggiefresh/website,koriroys/emberjs-website,SaladFork/emberjs-website,greyhwndz/website,tmock12/website,quangv/website,wifelette/website,datajohnny/website,bmac/website,wifelette/website,martndemus/website,workmanw/ember-website,bmac/website,bmac/website,maxcal/website,balupton/ember-website,rwjblue/website,knownasilya/website,knownasilya/website,martndemus/website,duggiefresh/website,koriroys/emberjs-website,SaladFork/emberjs-website,Eric-Guo/website,zeppelin/emberjs-website,ktornwall/website,greyhwndz/website,AgilionApps/website,koriroys/emberjs-website,jimmay5469/website,davidpett/website,mrjavascript/website,josemarluedke/ember-website,kpfefferle/website,Eric-Guo/website,davidpett/website,mrjavascript/website,zeppelin/emberjs-website,cyberkoi/website,davidpett/website,quangv/website,AaronSikes/website,tmock12/website,workmanw/ember-website,elidupuis/website,workmanw/ember-website,EricSchank/website,josemarluedke/ember-website,AgilionApps/website,martndemus/website,cllns/emberjs-website