[Server][README] Add require package.
[Server][README] Break one line.
[Server][README] Update version name to Ubuntu 14.04
[Client][README] Update version name from Ubuntu 13.10 to Ubuntu 14.04.
[Client][README] Use sudo command when command is used at
administrator rights.

Because, in ubuntu, usually, use sudo command when command is used at
administrator rights.
Revert "[Server][README] Break one line."

This reverts commit 9d1867921ba9d445cfdc9bcc9eff6a18e292f85a.

Because, this commit has 2 problems.
- It makes copy-and-paste inconvenient
- All the words are still not shown in other environment.
Merge pull request #220 from project-hatohol/update-README

Update readme