Add combine_all_yearly_contributions query parameter to fetch and combine all yearly contributions, not only recent contributions

[Atry]

Rendering result on my local server:

http://localhost:9999/api?username=Atry

http://localhost:9999/api?username=Atry&combine_all_yearly_contributions=true

This PR fixes #6

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[HwangTaehyun]

@Atry Thank you for the really awesome PR! I will look into it!

[HwangTaehyun]

@Atry Thank you for contribution!!

[Atry]

@HwangTaehyun Would you mind also reviewing other pull requests?