Fix windows support and fix Travis CI failure

[addisonElliott]

Fix two issues in the repository:

1. Fix eslint errors that cause Travis CI to fail. The error is a no-shadow issue with shadowing variables but this is not actually happening because the variables are defined in an if/else block so they will never shadow each other. Anyway, I fixed this by moving the declaration out of the if/else block
2. Fix windows support but updating the command string to search for in ps.lookup.
   • Rather than searching only for mongod.exe in Windows, I search for mongod or mongod.exe because both are valid commands in Windows.
   • When using mongodb-runner start command in Windows, the ps.lookup command returns mongod and not mongod.exe. Therefore, it would incorrectly state no instances are running when one was.

[addisonElliott]

Bump.

[imlucas]

Thanks @addisonElliott!