Added all new credential related routes

[jenow]

Creation of new actions in auth controller:

• [x] deleteMyCredentials
• [x] createMyCredentials
• [x] getMyCredentials
• [x] hasMyCredentials
• [x] updateMyCredentials
• [x] validateMyCredentials Creation of new actions in security controller:
• [x] createCredentials
• [x] deleteCredentials
• [x] getCredentialFields
• [x] getCredentials
• [x] getAllCredentialFields
• [x] hasCredentials
• [x] updateCredentials
• [x] validateCredentials

[codecov-io]

Codecov Report

Merging #69 into 2.x will increase coverage by 0.92%. The diff coverage is 100%.

@@            Coverage Diff            @@
##             2.x      #69      +/-   ##
=========================================
+ Coverage   87.2%   88.12%   +0.92%     
=========================================
  Files         15       15              
  Lines       1055     1154      +99     
=========================================
+ Hits         920     1017      +97     
- Misses       135      137       +2

Impacted Files	Coverage Δ
src/Security/Security.php	97.29% <100%> (+0.78%)	:arrow_up:
src/Kuzzle.php	88.94% <100%> (+0.4%)	:arrow_up:
src/Security/Document.php	91.11% <0%> (+0.63%)	:arrow_up:
src/Collection.php	89.14% <0%> (+0.72%)	:arrow_up:
src/Document.php	79.72% <0%> (+1.15%)	:arrow_up:

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