Require version file for checking capistrano version

[sanemat]

bundler-1.4.0.pre.1 works fine, but bundler-1.4.0.pre.2 shows error below:

$ bundle exec cap production deploy
/path/to/bundler-1.4.0.pre.2/lib/bundler/capistrano.rb:7:in `<top (required)>': uninitialized constant Capistrano::Version (NameError)

This commit brings this error, so I add require version file.
1d7a789

bundler: 1.4.0.pre.2
capistrano: 2.14.2

[sanemat]

#2597 @kirs

[kirs]

Sorry, my bad :(

[indirect]

Do all versions of capistrano supply capistrano/version? Or do we need to rescue the potential LoadError?

[sanemat]

@indirect
Ignore LoadError and check defined? const Capistrano::Version.

Future:
capistrano v3(at least 3.0.0.pre14)
capistrano/version exists, but I don't know this exists as ever.
(require 'capistrano' requires capistrano/version)

Past:
capistrano v1.3.0(2006-12-24) already had capistrano/version.
(require 'capistrano' does not require capistrano/version)

[indirect]

Sounds like we can simply check defined?(Capsitrano::VERSION) instead of requiring it ourselves, then, since we only care about the version if it's required automatically already.

[sanemat]

I agree 😃

[sanemat]

oops, I don't know capistrano v3 and later require 'capistrano requires capistrano/version as ever.

[sanemat]

It is not problem, so I simply check Capistrano::Version.

[sanemat]

@indirect Would you merge this?

[indirect]

I was waiting for the specs to be green, but I see it was a random failure. Thanks for the patch!

[sanemat]

Thanks! 😍😍