Use setting to determine if test should be ran for full installation

[chadwilken]

There was some discussion about bypassing the bundle install test command during installation in #95. I added an optional setting bundle_check_before_install that defaults to true. If you manually set to false it will perform a full installation with every deploy.

[capistrano-bot]

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🚫	Please put the * Your contribution here! line back into CHANGELOG.md.

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[chadwilken]

I resolved the merge conflicts, let me know if there is something else you need added to this.

[will-in-wi]

Sorry for the delay on review and feedback.

Could you also add some documentation of the new flag and what it does (probably mentioning the symlinking caveat from the original issue)? The Readme would probably be a fine place to add it.

[chadwilken]

@will-in-wi I added documentation to the README and updated the logic. You're correct about the logic for the if/unless statement. I was incorrectly handling the situation when they want to run bundle check to decide if bundle install is necessary.

[will-in-wi]

Thanks!