Add default sumo.json file for Windows

Add a default sumo.json file for Windows that captures the `Application`
and `System` event logs
Add default attributes for Windows support

Added a Windows platform specific configuration section to the
attributes.rb file.
Will install a 64 or 32 bit package depending on the system
architecture.

Additionally added new configuration attributes for the `sumo.conf` and
`sumo.json` files.  We need to extract these up to config params since
the hardcoded `/etc/` directory does not exist on Windows.
Update recipe files for Windows support

Updated the recipe files as necessary to support installing the Windows
collector.

Changes include:
- Replace file references to `/etc/sumo.*` to instead pull from the
value from the `sumo_*_path` attributes
- Added directory resources to create the parent directory for both the
`sumo.conf` and `sumo.json` files (on Linux this is /etc, which is safe
to assume exists.  On Windows we default to C:\sumo, which likely does
not exist by default).
- Pull the installer command from the `installerCmd` attribute instead
of hard coding in `install.rb`
- For file and directory resources, only define `owner`, `group`, and
`mode` values on Linux (otherwise WARNings are generated on Windows
Dynamically set the sumo.json path in sumo.conf.erb

Updated the template `sumo.conf.erb` to pull the path to `sumo.json` via
the `sumo_json_path` attribute instead of hard coding this to
`/etc/sumo.json`.
Update README for Windows

Updated the README file to document Windows support.

Additionally removed the duplicate attribute definition for the
`ephemeral` option.
Document why c:\sumo is the default install dir

Updated `default.rb` to document why we default the install directory on
Windows to `C:\sumo` instead of 'C:\Program Files\Sumo Logic Collector`
(which is the default location used when installing from the Sumo GUI
installer).

See https://tickets.opscode.com/browse/CHEF-4453 for more details.
Merge pull request #25 from kppullin/windows-support

Enhance cookbook with Windows support