Use code.interact to launch standard Python REPL

[tkf]

workaround for #7

• Make Python namespace persistent.
• Make standard Python REPL the default (until threading issue is resolved).
• Add an option to set default REPL invoked via .

[codecov-io]

Codecov Report

Merging #9 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master       #9   +/-   ##
=======================================
  Coverage   78.57%   78.57%           
=======================================
  Files           4        4           
  Lines          84       84           
=======================================
  Hits           66       66           
  Misses         18       18

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[coveralls]

Pull Request Test Coverage Report for Build 54

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 78.571%

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Totals
Change from base Build 47:	0.0%
Covered Lines:	66
Relevant Lines:	84

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💛 - Coveralls