Create namespaced scopes

[caiohsramos]

Closes #733

Creates namespaced scopes when namespace: ... option is provided. Keeps current behaviour of creating unnamespaced scopes.

Example

aasm column: :final_targeting_state, namespace: :final_targeting, create_scopes: true do
  state :unstarted, initial: true
  state :started
  state :succeeded
  state :failed
end

creates the scopes:

• klass.final_targeting_unstarted
• klass.final_targeting_started
• klass.final_targeting_succeeded
• klass.final_targeting_failed
• klass.unstarted
• klass.started
• klass.succeeded
• klass.failed

[codeclimate]

Code Climate has analyzed commit 7b7b2dd and detected 0 issues on this pull request.

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[codecov-io]

Codecov Report

Merging #735 (7b7b2dd) into master (8622d3e) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #735      +/-   ##
==========================================
+ Coverage   95.36%   95.38%   +0.02%     
==========================================
  Files          35       35              
  Lines        1252     1258       +6     
==========================================
+ Hits         1194     1200       +6     
  Misses         58       58              

Impacted Files	Coverage Δ
lib/aasm/persistence/base.rb	93.93% <100.00%> (+1.34%)	⬆️

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[anilmaurya]

Thank you @caiohsramos for the contribution. 👍