Making some simplifications in the contributing doc.
Making some simplifications in the contributing doc.

mryellow/Durandal,davismj/Durandal,mryellow/Durandal,BlueSpire/Durandal,Craga89/Durandal,davismj/Durandal,davismj/Durandal,Craga89/Durandal,Craga89/Durandal,BlueSpire/Durandal,BlueSpire/Durandal,mryellow/Durandal,BlueSpire/Durandal,mryellow/Durandal,davismj/Durandal,Craga89/Durandal