Fixed bug in __str__ and __add__ overload operators for bandit SampleArm and HistoricalData.
Added tests for SampleArm.__add__
Fixed SampleArm.__add_. Now returns a new SampleArm, does not modify original arm. Also added more tests.
use deepcopy to copy historical_info for testing so it does not modify the test case.
Added checking that the arm given to SampleArm.__add__ is a SampleArm.
Merge branch 'master' of https://github.com/Yelp/MOE into norases_387_fix_bandit_bugs_and_add_new_tests
Updated ValueError comment for SampleArm.__add__
Reverted isinstance check for SampleArm.__add__
Started bandit easy_interface
Added __iadd__ and __radd__ to SampleArm.
Added bandit_example to moe_examples
Validate SampleArm.__iadd__ and added a test for it.
Added and fixed errors in moe_examples/bandit_example.py
Fixed Eric's comments and updated SampleArm.__iadd__ test.
Initial blog example
Fixed docstring too long and assertion too long in SampleArm tests.
Added bandit_example_test to moe_example.
Updated CHANGELOG.
Merge pull request #389 from Yelp/norases_387_fix_bandit_bugs_and_add_new_tests

Fixed str and add bugs in bandit data containers
Merge branch 'master' of https://github.com/Yelp/MOE into norases_386_add_bandits_to_moe_examples