Although he’s not quite the household name as Bill Gates, Microsoft co-founder Paul Allen is undeniably an incredibly influential technology innovator. But while Allen and Gates revolutionized the computer software landscape together — and become billionaires in the process — there were times when their partnership wasn’t as solid as it appeared to outsiders. Allen’s new memoir Idea Man chronicles the development of Microsoft as well as the unique relationship between the company’s two founders. While the two started the company as friends, Allen says Gates’ competitive nature…