Corrected import of constants
ic: IC4008 reimplemented as 4 Bit Carry Look Ahead Adder fixes #210
ic: IC4008 reimplemented as 4 Bit Carry Look Ahead Adder fixes #210
PEP8 fix in series_4000
made map() compatible with python 3.x
Added set -e to travis test script. This will allow it to exit with error code upon nosetest/pep8 failure
makeboolean: make map compatible with python 3.x
Merge pull request #4 from rvraghav93/salil93-bus

A Few corrections  and CLA IC 4008