Merge pull request #14 from huacnlee/master

改进 Upyun 初始化，共享连接
0.1.6
Update lib/carrierwave/storage/upyun.rb

解决 “改进 Upyun 初始化，减少连接的过程” 中bucket混乱的问题
属于issue #16
Merge pull request #18 from vvdpzz/master

Fix issue 16 并减少连接
Merge remote-tracking branch 'nowa/master'
Version to 0.1.7