Apply PSR Code Styling Standard to the library #89
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1. Objective
There are bunch of legacy codes that don't comply with the PSR-2 Code Standard.
This pull request is aiming to clean up those legacy codes.
2. Description of changes
Apply PSR-2 Code Standard to the library.
However, there is still 1 leftover place that won't be updated in this pull request, which is OmiseException class.
The reason is that this class will be refactor later on in the coming pull request. (as it requires more than just update code styling but more on a refactoring part. So I leave it for an appropriate pull request).