Find Minimum in Rotated Sorted Array problem.
For more infomation, refer to
https://oj.leetcode.com/problems/find-minimum-in-rotated-sorted-array/
https://oj.leetcode.com/problems/find-minimum-in-rotated-sorted-array-ii/
Merge branch 'master' of https://github.com/zydecx/LeetCode
Move class Solution to private static of main class, for avoiding
conflicts with other class in the same package.