Ignore Unix Hidden Files for Analogy Task

[yuanzhiKe]

The unix-like systems like mac and linux distributions will automatically create some hidden files whose names are started with '.' under the data folders, which makes the analogy.py down
I simply add 2 lines to let it ignore such files.

[coveralls]

Pull Request Test Coverage Report for Build 846

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.001%) to 95.114%

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Totals
Change from base Build 843:	0.001%
Covered Lines:	4516
Relevant Lines:	4748

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💛 - Coveralls

[undertherain]

Thank you for noticing this and trying to contribute to code right away

Few points about your PR:

1. other benchmarks also use datasets with multiple files. This path should go not to the analogy module, but to Dataset class

2. please do not violate coding standards in order to reduce number of lines not covered with tests. instead add a file starting with . to the test dataset

3. using split on paths is not the best practice. widows users use forward slash instead of back slash. use methods of os module.

[yuanzhiKe]

Thank you for noticing this and trying to contribute to code right away

Few points about your PR:

1. other benchmarks also use datasets with multiple files. This path should go not to the analogy module, but to Dataset class
2. please do not violate coding standards in order to reduce number of lines not covered with tests. instead add a file starting with . to the test dataset
3. using split on paths is not the best practice. widows users use forward slash instead of back slash. use methods of os module.

Thank you for your quick reply.
Sorry for the mistakes.
I will update test scripts as well, and use os.path to get the filename.