Update: introduction memo.

Improve: some figures and text.

Merge pull request William-Yeh#8 from William-Yeh/v3.0-rc

第四梯次實作範例完成，請下載 - Lab materials completed for 4th Stage

新增：在 Windows 上執行 Vagrant 的相關問題。

Add: trouble shooting about running Vagrant under Windows.

Add: maven example.

Version for 1st workshop (2015-02-07), including patch.

Pages for 1st workshop (2015-02-07), including patch.