Fix webmachine_demo start: use ensure_all_started
Fix webmachine_demo start: use ensure_all_started

Previously we were getting a crash on start due to ssl not being
started. Using ensure_all_started fixes this, and also allows us to
remove some of the boilerplate code for manually starting other
application dependencies.

campanja/webmachine,liuhongchao/webmachine,chef/webmachine,Webmachine/webmachine,campanja/webmachine,basho/webmachine,kellymclaughlin/webmachine,liuhongchao/webmachine,lemenkov/webmachine,Webmachine/webmachine,joedevivo/webmachine,tsloughter/webmachine,sdebnath/webmachine,kellymclaughlin/webmachine,sdebnath/webmachine,chef/webmachine,joedevivo/webmachine,lemenkov/webmachine,joedevivo/webmachine,basho/webmachine,tsloughter/webmachine