Drop ruby-2.0 and mustermann19, use mustermann-grape instead

[namusyaka]

ref #1469

[grape-bot]

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[namusyaka]

OMG, latest mustermann requires ruby-2.1 or later.
@dblock What do you think?

[dblock]

I say we go for it and drop 2.0. Rails already requires 2.2.

[dblock]

Does Rails 3 not work with Ruby 2.1? If so we should mention it and git rm gemfiles/rails_3.gemfile and remove it from Appraisals.

[dblock]

I release 0.17.0, maybe make a major version increment (replace 0.17.1 -> 0.18.0) with this PR?

[dblock]

Bump @namusyaka?

[namusyaka]

Sorry for the delay. rails-3.2-stable seems like to support ruby 2.1.

I release 0.17.0, maybe make a major version increment (replace 0.17.1 -> 0.18.0) with this PR?

Yeah, the major version should be incremented, but I'd like to merge a few things for fixing bugs.

[namusyaka]

Just rebased and force pushed.

[dblock]

You also need to drop rails 3 from appraisals, no?

[dblock]

If you don't mind cleaning this up. Looks like some case-sensitive changes creeped in here that shouldn't be part of this commit.

[namusyaka]

OMG, sorry. fixed.

[namusyaka]

rails-3.2 and ruby-2.1 has passed specs on travis. https://travis-ci.org/ruby-grape/grape/jobs/158980775

[dblock]

Merged, thanks!