Merge pull request #165 from BluntBlade/master

同步更新
Merge pull request #166 from BluntBlade/master

同步更新
Add “Download” Section

Add “Download” Section
added “Download” Section

added “Download” Section
Update android-sdk.md

change section title from download to download-link
Merge pull request #167 from florakfz/master

add download section
Update qboxrsctl.md
Update exif.md
Merge pull request #168 from rwifeng/patch-2

Update qboxrsctl.md
Merge pull request #169 from rwifeng/patch-3

Update exif.md
Update index.md

add list file navigation
Merge pull request #170 from rwifeng/patch-4

Update index.md
Update java-sdk.md
Merge pull request #171 from simon-liubin/master

Update java-sdk.md
Update java-sdk.md
Update java-sdk.md
show list apidoc
add a new menu named best-practice-of-qiniu in homepage
Merge pull request #172 from simon-liubin/master

Update java-sdk.md
Merge pull request #173 from rwifeng/list_show

show list apidoc