removed unnecessary console output
changed userdata schema
Poprawienie UserData na userData - byl blad przy uruchamianiu
populate.js:
	added paramater - number of companies
	it now clear companies collection before adding
Add function deleting all companies (need for populate.js).
Added function getAllWithLastChange
This closes #54.
Added price history and calculating price change. This close #51, #52 and #53.
Fixed problems with communication between Generator and Server
when data is fragmented.
And minor fixes.
minor fixes
small changes in userdata schema
Merge branch 'Kaluski' into Zarnowski