默认修改头像时如果上传的图片为png透明图片，生成的头像透明部分会变成黑色，修改了生成头像为png格式。可正常显示图片透明部分。
Signed-off-by: BlossomWave <316975215@qq.com>

Merge pull request !604 from 也曾为你、像超人/master

Merge pull request !603 from kknd97/N/A

Merge pull request !601 from abbfun/N/A

Merge pull request !605 from Rain/N/A

Signed-off-by: Rain <938448486@qq.com>

handleUpdate(row)方法中：this.form = response.data;语句
会导致【this.form.postIds = response.postIds;】和【this.form.roleIds = response.roleIds;】失效。
导致用户编辑对话框中，角色和部门多选框无法正常修改。
建议使用以下语句修改：
this.$set(this.form, "postIds", response.postIds);
this.$set(this.form, "roleIds", response.roleIds);
Signed-off-by: kknd97 <liujingwei@ln.chinamobile.com>

Signed-off-by: abbfun <819589789@qq.com>

Merge pull request !595 from 也曾为你、像超人/N/A

Signed-off-by: 也曾为你、像超人 <1553592282@qq.com>

Merge pull request !581 from 也曾为你、像超人/N/A

Signed-off-by: 也曾为你、像超人 <1553592282@qq.com>

Merge pull request !574 from 捏造的信仰/fix-I5Q2ZO

Merge pull request !568 from coverme/N/A

Signed-off-by: 捏造的信仰 <yiding.he@gmail.com>

Signed-off-by: 胡亚飞 <huyafeily@aliyun.com>

Merge pull request !564 from 捏造的信仰/fix-issue-I5NNXI