remove throw exception in libupdate.

Signed-off-by: Jack <jack.wgm@gmail.com>
add avhttp for download.

Signed-off-by: Jack <jack.wgm@gmail.com>
1. implementation check_update.
2. change encode to utf8.
3. fix check.

Signed-off-by: Jack <jack.wgm@gmail.com>
fix bug

Signed-off-by: Jack <jack.wgm@gmail.com>
Add xml modify option
Merge pull request #1 from hcaihao/master

Add xml modify option
Fix resize bug of xml edit control
Merge pull request #2 from hcaihao/master

Fix resize bug of xml edit control
Merge pull request #2 from Jackarain/master

一些更新.