Update index.md
Update memory.md
修正错字，并修正翻译

根据原文 "to run your app on the emulator you need to first create an Android Virtual Device (AVD). An AVD is a device configuration for the Android emulator that allows you to model different devices.”。修正了翻译。
Merge pull request #125 from minixalpha/patch-3

修正错字，并修正翻译
增加在线阅读链接
Update receive.md
update md for compile books for pdf and epub
Merge pull request #123 from Andrwyw/patch-7

Update memory.md
Merge pull request #126 from Andrwyw/patch-9

Update receive.md
Merge pull request #122 from Andrwyw/patch-6

Update index.md 为out-of-the-box添加解释（可直接使用、无需配置）
Fix "argetSdkVersion" to "targetSdkVersion"
修正部分格式
修正部分格式翻译链接
Update database.md
“再其他地方调用了finish()方法" 改为”在其他地方调用了finish()方法“
Merge pull request #127 from Lin-H/master

提交部分校对
Merge pull request #128 from sweetIan/patch-1

Update database.md
Update creating.md
Merge pull request #8 from kesenhoo/master

合并更新
校对1.1.2节

修正部分格式