adds ICs 4000, 4001, 4002, 4011, 4012, 4023, 4025, 4068, 4069, 4070, 4071, 4072, 4073, 4075, 4077, 4078, 4081 and 4082
adds tests for 4000, 4001, 4002, 4011, 4012, 4023, 4025, 4068, 4069, 4070, 4071, 4072, 4073, 4075, 4077, 4078, 4081, 4082
adds example files for 4000 series ICs
adds series_4000_test.py to .travis.yml
edits README.md to add series 4000 ICs
edits description of series_4000 ICs
delets tests for 4081 and 4082
Merge pull request #112 from gargshashank5/series4000

Series4000