Merge pull request #217 from BluntBlade/master

添加 frameNumber 图片信息项目。
add ];
cancel test case
Merge pull request #218 from longbai/new-ios

New ios
Update put-policy.md

specify 'Content-Type' to callback
Update pfop.md

specify 'content-type' to notify url
Merge pull request #219 from rwifeng/patch-22

Update put-policy.md
Merge pull request #220 from rwifeng/patch-23

Update pfop.md
fix gravity description
add limit of vars
fix bug which object-c sdk icon hide in download page
android sdk
Merge pull request #221 from forrest-mao/doc/developer

fix gravity description
Merge pull request #222 from SunLn/fix_ios_icon_not_show_bug

fix bug which object-c sdk icon hide in download page
Merge pull request #223 from longbai/new-android

android sdk
sdk document
Merge pull request #224 from longbai/new-android

sdk document
format
Merge pull request #225 from longbai/new-android

format
Update saveas.md