By Bret Kenwell Salesforce stock has fallen 50% from its high to its low but is rallying after the earnings report. Is it indeed a buy? Shares of Salesforce (CRM) – Get Salesforce, Inc. Report at last check was double-digits percent higher on June 1 after the customer-relations-management-software icon reported earnings after the close May 31. Given the horrendous trading in tech stocks this year — at one point, the Nasdaq was down more than 30% from its high — the bulls are breathing a sigh of relief with the Salesforce action. Salesforce wasn’t an exception to the selloff. The shares were …