Can I read a Load Cell value from Electric Imp?
A load cell provide the tiniest voltage as an output. This voltage is in the millivolts. 

The XH711 is not just an amplifier but also a 24bit ADC that can handle bipolar signals. 

If we assume that the reading is 80mV full scale (using the XH711 as an example) and the electric imp has a 12bit ADC and runs on 3.3 volts then in that 8mV scale you have about 99 steps which is 4.1% of the the 12bit ADC range. 

You could use the electric imp alone but your reading would be so in the mud it would not be worth it. Further the imp is not capable of reading negative voltages. 

Use the amplifier/ADC combo like the XH711. Then read the digital output with the electric imp.