Try to detect and remove local paths from error messages when generating a ‘search for existing tickets’ URL.

Closes https://github.com/CocoaPods/CocoaPods/issues/2057
[ErrorReporter] Extract pathless_exception_message
[Hound] Remove trailing whitespace
Print current version when the repo/lockfile requires a higher version

Closes https://github.com/CocoaPods/CocoaPods/issues/2049
[Spec] Added ErrorReport spec
[Hound] Clean ErrorReport Spec
Merge pull request #2051 from segiddins/helpful-outdated-repo-errors

Print current version when the repo/lockfile requires a higher version
[Spec] Fix ErrorReport spec
[Hound] Remove errant `puts` from spec
Merge pull request #2080 from segiddins/remove-local-path-from-ticket-search-url

Try to detect and remove local paths from error messages when generating...
[Command] Don't default `pod` to `pod install`

I'm sure everyone is going to hate me for doing this.

Fixes #1771
Closes #1966