jQuery UI upgrade to 1.12

[Borzik]

Since directory structure has changed in 1.12, previous build system didn't work for 1.12.
jQuery UI doesn't have build info files, so there's no optimal way to get dependency list for each file. I ended up with parsing define([...deps], factory) block of each JS file.

As a result:

• we completely follow jQuery UI 1.12 folder structure (only ui subfolder has been dropped for usage simplicity)
• widgets, i18n and effects now have their own directories
• gem version went up to 6.0.0, since this is a breaking change for most users, and since we upgrade to 1.12
• also I had to upgrade Travis Ruby version to 2.2.2 because 1.9.3 doesn't work with your gemspec anymore

I've also updated readme.md to follow new directory structure.

Please let me know any questions you have.

And it closes #103

[scarroll32]

Please merge this :-)

[ttrmw]

+1

[hunterlong]

+1

[okamos]

+1

[joliss]

Thanks for the PR! Some comments:

• I cannot seem to install the "json" gem with Ruby 2.3. I've had to update the dependency like so:

diff --git a/jquery-ui-rails.gemspec b/jquery-ui-rails.gemspec
index 4ba6e19..43d58e9 100644
--- a/jquery-ui-rails.gemspec
+++ b/jquery-ui-rails.gemspec
@@ -15,7 +15,7 @@ Gem::Specification.new do |s|

   s.add_dependency "railties", ">= 3.2.16"

-  s.add_development_dependency "json", "~> 1.7"
+  s.add_development_dependency "json", "~> 2.0.2"

   s.files        = `git ls-files`.split("\n").reject { |f| f =~ /^testapp|^jquery-ui/ }
   s.executables  = `git ls-files -- bin/*`.split("\n").map { |f| File.basename(f) }

• When I merge your PR and run rake, it leaves app/assets/javascripts/jquery-ui/widgets/ empty and git status shows a bunch of files changed. I'd expect it to just regenerate everything in app/assets without change. Never mind this, I forgot to run git submodule update.

[joliss]

• Some of your commits are just fixes to earlier commits. Can you use git rebase -i and squash them accordingly, please?

[joliss]

I don't think there should be a trailing .js here, should there?

[Borzik]

@joliss thanks for review!
Re: JSON gem: initial gemspec worked for me when I tested everything, but anyway, I've updated it with the code you had provided.
Re: trailing .js extensions: I've missed those somehow. Pushing a fix.
Re: commits that are fixes: it seems like you can squash all commits from PR together on merge. If you still think it would be better if I did that — I'll have to close this PR and create a new one from another branch, because the source branch is being used by me in some projects already, and someone else could have used that as well.

[joliss]

Great, thanks! I've released v6.0.0 of this gem.