scroll section : 1/2
Merge pull request #43 from zhaochunqi/gh-pages

翻译提交
Update starting-activity.html

Intent拼错了
enable-app-indexing翻译初稿

翻译完成，进度100%
Merge pull request #44 from gdqyn/gh-pages

Update starting-activity.html
Merge pull request #45 from Lin-H/gh-pages

enable-app-indexing翻译初稿
Add Origin Links For Post
添加文章序言
Compile Book
scroll section:2/2 ;waiting for revise
Merge pull request #46 from Andrwyw/gh-pages

scroll节，细节待调整
the draft of front two sections
revise the draft
accomplish the draft of third section
fix strong words
revise the front three parts
add the forth part
add strong tag
add the fifth part
add index.md