ApiAuth middleware and other improvements

[adhocore]

closes #9

• api auth middleware
• api authenticator interface with factory implementation
• abort() in middleware can now output json content
• di:resolve no longer throws for nullable sub class as dependency
• gitignore more stuffs

[codecov-io]

Codecov Report

Merging #26 into master will increase coverage by 0.33%. The diff coverage is 100%.

@@             Coverage Diff              @@
##             master      #26      +/-   ##
============================================
+ Coverage        98%   98.34%   +0.33%     
- Complexity      252      299      +47     
============================================
  Files            20       22       +2     
  Lines           603      725     +122     
============================================
+ Hits            591      713     +122     
  Misses           12       12

Impacted Files	Coverage Δ	Complexity Δ
src/Factory/ApiAuthenticator.php	100% <100%> (ø)	14 <14> (?)
src/Http/Middlewares.php	100% <100%> (ø)	17 <2> (+1)	:arrow_up:
src/Di/Extension.php	100% <100%> (ø)	31 <3> (+3)	:arrow_up:
src/Http/Middleware/ApiAuth.php	100% <100%> (ø)	27 <27> (?)
src/Http/BaseMiddleware.php	100% <100%> (ø)	11 <4> (+2)	:arrow_up:

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