Added error about granting permission

[joshdholtz]

Changes

• Waits for "instruments" process to listen for a failure
  • Let's user know how to solve if the error involves granting permission
• Added some files to .gitignore
• Added shared Example scheme to example Xcode project

How to test

• Created a new user on my mac (testuser1)
• Added testuser1 to sudoers file (because I needed to install gems and sometimes delete things when I messed up)
• Cloned my fork
• Ran example project and saw failure but help message 🎉 🎊

[KrauseFx]

Thanks @joshdholtz, that's a great pull request.

Does instruments put out Instruments wants permission to analyze other processes? I haven't seen it before.

[KrauseFx]

Oh, it looks like you duplicated a scheme, I'll remove it again.

[joshdholtz]

@KrauseFx Yes sir, it does spit out that "wants permission to analyze other processes" message. I can verify on some co-workers machines today.

Also, the scheme thing was weird. I opened the project right after I cloned and it had a scheme but then for some reason it stopped showing it which is why I added it.

And thanks for the merge 😁

[KrauseFx]

Thanks again @joshdholtz, it looks great. I published a new version already! https://github.com/KrauseFx/snapshot/releases