Sort requires and keywords in composer.json

[lucasmichot]

• Sort import in composer.json : this allows to get less noise in commits when adding/updating/deleting an entry
• Add support for phpunit 5
• Use new || syntax
• Stay consistant and use tilde (~) syntax for Mockery

[codecov-io]

Current coverage is 93.63%

Merging #20 into master will not affect coverage as of 9528bd0

@@            master     #20   diff @@
======================================
  Files            7       7       
  Stmts          157     157       
  Branches         0       0       
  Methods         25      25       
======================================
  Hit            147     147       
  Partial          0       0       
  Missed          10      10       

Review entire Coverage Diff as of 9528bd0

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