Adding extreme-programming cheat sheet#14

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OlivierCo wants to merge 4 commits intoericdrowell:masterfrom

OlivierCo:master

Commits on Mar 20, 2016

Adding extreme-programming cheat sheet
Colonna, Olivier
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Commits on Mar 21, 2016

Adding more definition to extreme programming
Colonna, Olivier
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Finishing more definition to extreme programming
Colonna, Olivier
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fixing missing coma
Colonna, Olivier
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