Indent is off by one and snippet check is currently inverse

[dmartinezg]

Add test for regression

[blakeembrey]

Sorry for the delay, I just went ahead and fixed a few more things with the error message output while testing. Namely:

• Length of snippet was off by one when an odd number
• Indent was off by one (original PR)
• Non-printable characters messed up the error message carat offset in display
• Snippet check is no longer inverted (original PR)
• No more duplicate message in Error#toString from same context and message
• Non-printable error message column was off by one

Edit: Wasn't sure whether to include non-printable characters in the character count and/or strip them, so I left them there and only adjusted the rendered carat index.

[dmartinezg]

Remove the '.only()' and merge

[blakeembrey]

Removed and I added a timeout to the remote call test (was failing otherwise, at least locally). Should remove that later so we're not hitting a random insurance company servers.