Update extension.py to support Blueprint Name in init

[waldobeest]

Adding APISPEC_BLUEPRINT_NAME, to prevent Error:

AssertionError: A name collision occurred between blueprints <flask.blueprints.Blueprint object at 0x11f474cc0> and <flask.blueprints.Blueprint object at 0x11ee7b898>. Both share the same name "flask-apispec". Blueprints that are created on the fly need unique names.

When trying to create 2 separate swagger endpoints for a set of resources. (i.e Public and Private)

[codecov-io]

Codecov Report

Merging #167 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #167   +/-   ##
=======================================
  Coverage   97.71%   97.71%           
=======================================
  Files           8        8           
  Lines         350      350           
=======================================
  Hits          342      342           
  Misses          8        8

Impacted Files	Coverage Δ
flask_apispec/extension.py	100% <ø> (ø)	⬆️

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[olegyablokov]

Any updates?

[codecov-commenter]

Codecov Report

Merging #167 (805f132) into master (1842221) will not change coverage.
The diff coverage is n/a.

❗ Current head 805f132 differs from pull request most recent head b0826af. Consider uploading reports for the commit b0826af to get more accurate results

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@@           Coverage Diff           @@
##           master     #167   +/-   ##
=======================================
  Coverage   97.71%   97.71%           
=======================================
  Files           8        8           
  Lines         350      350           
=======================================
  Hits          342      342           
  Misses          8        8           

Impacted Files	Coverage Δ
flask_apispec/extension.py	100.00% <ø> (ø)