Merge pull request #68 from Firef0x/master

v3.4.2-2 built for Arch Linux
Merge pull request #70 from Firef0x/master

Add guide for installing from repo in README.md
rpm v3.4.2-3.fc20 built
Update README.md

更新了 Fedora 系列的安装方式, 使用 fedora copr 以便于软件更新.
Merge pull request #73 from wangjiezhe/master

Update README.md
v3.5.1-1 built for debian
v3.5.1-1 built for Arch Linux

为 Arch Linux 编译 v3.5.1-1
1. 打包脚本更新至 3.5.1-1 ，去除依赖 webkitgtk
2. bcloud 安装包更新至 3.5.1-1
3. 更新 checksum.txt 中的包校验码