Adding 3 new functions: Integers, PrependTo and ContainsOnly #691
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This pull request includes the implementation of the following functions:
Note: The IPython API version 6.0+ does not support Python 2.6, 2.7, 3.0, 3.1, or 3.2. So I have changed the .travis.yml to install IPython 5.0 for covering all the test cases.