Registers examples added
function name changed from FourBitRegister2 to FourBitLoadRegister
function name changed from FourBitRegister2 to FourBitLoadRegister
pep8
Merge branch 'develop' into newex
Merge branch 'develop' into newex
__repr__ corrected
PEP8
Added Analog sources, Resistor
IC added
IC tests added
Operations overridden
Tests for analog devices
Tests for analog sources
.travis and __init__ updated
Merge branch 'develop' into newex
Bug #178 corrected
docs changed
Merge pull request #172 from rajat974/newex

Analog devices , power, current sources added, Examples for registers added and some minor bugs fixed