Added timezone awareness option when saving the MicroBlogPost model.

[lucabezerra]

Also updated .gitignore and merged all requirement files into a single test_requirements.txt.

Description

When running the tests for Vinta Site, a series of warnings were being thrown, regarding naive vs aware timezones. A fix in the save method of the MicroBlogPost model now allows a client using this lib to pass a 'timezone' key-value argument to the save method of this model which has the timezone string as its value (e.g. 'America/Sao_Paulo').

Motivation and Context

Issue: https://github.com/vintasoftware/vinta-site/issues/167

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [x] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [x] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.

[codecov-io]

Codecov Report

Merging #12 into master will decrease coverage by 1.13%. The diff coverage is 50%.

@@            Coverage Diff             @@
##           master      #12      +/-   ##
==========================================
- Coverage   95.37%   94.23%   -1.14%     
==========================================
  Files          10       10              
  Lines         238      243       +5     
  Branches       13       14       +1     
==========================================
+ Hits          227      229       +2     
- Misses         11       13       +2     
- Partials        0        1       +1

Impacted Files	Coverage Δ
knowledge_share/models.py	94% <50%> (-6%)	:arrow_down:

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