1. Added support for scanning barcodes. Right now it is very incomplete
and it doesn't support 1D barcodes. Also the barcode format for IMEIs
isn't supported in ZXing.
2.While renting devices, now you must search by IMEI and not by name.
3. In the device management page, while selecting device to
view/update/delete, I disabled the combobox for searching devices ba
name. Comboboxes should be used for fields that hold unique values.
4. Changed the alignment of the button to delete a device to
ALIGN_BOTTOM(looks better).