Add shebang line to test scripts

[paultcochrane]

Perl::Critic (at severity level 4) warns that these files don't contain a package declaration. It is considered by Perl::Critic that any file that isn't a module is a program, and hence needs a shebang line pointing to the perl interpreter to denote this. This change silences this warning.

[coveralls]

Coverage remained the same at 99.492% when pulling ae0e29edf84af2d72f0ba4591480176147959717 on paultcochrane:pr/add-shebang-to-tests into 7d29212a39035ea913e279967686cec76ee8266d on fayland:master.

[codecov-io]

Current coverage is 93.40% (diff: 100%)

Merging #27 into master will not change coverage

@@             master        #27   diff @@
==========================================
  Files            14         14          
  Lines           197        197          
  Methods           0          0          
  Messages          0          0          
  Branches         26         26          
==========================================
  Hits            184        184          
  Misses            1          1          
  Partials         12         12          

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