included ic7459 and ic74138
included new ic74138 and ic7445 using combinational.py
included ic74138 ic7459 and modified ic74138 and ic7445 using combinational.py
added tests for IC_7445_new,IC_7459,IC_74138,IC_74138_new
Pull changes from shrutig:ic2
Resolve merge conflict of PR https://github.com/BinPy/BinPy/pull/149
PEP8 fixes
PEP8 Fixes to series_7400_tests.py
PEP8 Fixes to series_7400.py
Merge pull request #221 from debugger22/develop

Make PyQt4 soft dependency
Corrected IC tests. Ordered IC classes. Removed the new tag
PEP8 and removed debug line
Merge pull request #3 from rvraghav93/shrutig-ic2

Shrutig ic2
Remove merge conflict
Add shrutig to AUTHORS
Merge pull request #209 from debugger22/shrutig-ic2

Shrutig ic2
Merge branch 'develop' of https://github.com/BinPy/BinPy into develop