Allow to set multiple ProxyPassReverse directives

[roidelapluie]

Useful when used with proxy balancers

[underscorgan]

This should be wrapped in an array like Array(proxy['reverse_urls']).each do |rurl| so it doesn't crash if a single reverse URL is passed.

[underscorgan]

This requires README updates and test coverage.

[roidelapluie]

@mhaskel Done :-)

[underscorgan]

This should be -%>

[roidelapluie]

@mhaskel changes done

[underscorgan]

@roidelapluie I'm seeing test failures when I run the unit tests locally:

rspec ./spec/defines/vhost_spec.rb:701 # apache::vhost os-independent items .conf content when proxy_pass is {"path"=>"/path-a", "url"=>"http://fake.com/a"} should accept proxy_pass hash: matches
rspec ./spec/defines/vhost_spec.rb:701 # apache::vhost os-independent items .conf content when proxy_pass is {"path"=>"/path-a", "url"=>"http://fake.com/a", "reverse_urls"=>"http://127.0.0.1:8080"} should
 accept reverse_urls string: matches
rspec ./spec/defines/vhost_spec.rb:701 # apache::vhost os-independent items .conf content when proxy_pass is {"path"=>"/path-a", "url"=>"http://fake.com/a", "reverse_urls"=>["http://127.0.0.1:8080", "http
://127.0.0.1:8081"]} should accept reverse_urls array: matches
rspec ./spec/defines/vhost_spec.rb:701 # apache::vhost os-independent items .conf content when proxy_pass is [{"path"=>"/path-a/", "url"=>"http://fake.com/a/"}, {"path"=>"/path-b", "url"=>"http://fake.com
/b"}] should accept proxy_pass array of hash: matches

Also, we fixed the travis-ci issues that were in master, so if you rebase it will be easier to see that the tests were fixed :)

[roidelapluie]

@mhaskel this is fixed and rebased now

[igalic]

@roidelapluie please also squash your commits down to one. (It's nice for git-bisect if every commit passes tests)

[roidelapluie]

@igalic done

[underscorgan]

@roidelapluie thanks for the contribution!