Scanner was able to scan the barcode when battery was low or critical even if the LowBatteryScan was set to false in config.xml or if user was setting the LowBatteryScan property to false.
Hence modified the implementation logic under 2.2 API & Common API of Barcode Module & also modified the document.
Merge pull request #232 from rhomobile/BLR_LowBatteryScan_Config_Issue

Scanner was able to scan the barcode when battery was low or critical