Use ActiveRecord::Migrator  multiple migrations paths support

[#44034071]

ActiveRecord::Migrator has a class attribute, migrations_paths,
specificially for storing a list of different directories that have
migrations in them.  ActiveRecord::Migrator.migrations_paths is used in
rake db:load_config, which is a dependency of db:migrate, etc. that is
passed to ActiveRecord::Migrator.migrate.  Since migrate supports an
array of directories, and not just a single directory, there is no need
to merge all the migrations paths into one temporary directory as was
previously done.
Correct return type of Msf::DBManager#migrate.
Document Msf::DBManager#initialize_metasploit_data_models
Armitage 04.06.13

This update to Armitage improves its responsiveness when connected
to a team server over a high latency network. This update also adds
a publish/query/subscribe API to Cortana.
Update Gemfile to metaploit_data_models 0.6.0

[#44034071]
Update gemcache with metasploit_data_models 0.6.0

[#44034071]
Merge pull request #1536 from rapid7/feature/active-record-migrator-migrations-paths

Use ActiveRecord::Migrator  multiple migrations paths support
Added CoDeSyS Gateway.exe Server remote execution via arbitrary file creation
Merge branch 'codesys_gateway_server_remote_execution.rb' of github.com:nahualito/metasploit-framework into nahualito-codesys_gateway_server_remote_execution.rb
Fixed EOL, bad indent, added header, removed #!/usr/env/ruby
Fixed more styling issues, EOL, tabs and headers
Whitespace
Merge branch 'codesys_gateway_server_remote_execution.rb' of github.com:nahualito/metasploit-framework into nahualito-codesys_gateway_server_remote_execution.rb
Empty commit, please ignore.

Testing some deploy magic.
Format cleanup
That's not a real check...
Rename module to better describe the bug.
Updates the description
Merge branch 'nahualito-codesys_gateway_server_remote_execution.rb'
Merge branch 'rsmudge-armitage'