use progurad to shrink code size
load photos/vidoes from all possible default location

Camera photos and vidoes has diffent default locations on diffent phones.

* /sdcard/DCIM/Camera     (most Anroid phones)
* /sdcard/DCIM            (Lenovo A820t)
* /sdcard/DCIM/100MEDIA   (HTC 2.2)

We try to load all of them when choosing photos/vidoes to upload.
updated version to 0.9.1