Organize platform specific configuration files in eclipse plugin

To make it easier for users, the source code for the i2b2 Workbench will be delivered with several eclipse.product files. Each file will be configured for a specific platform (i.e. Linux, Mac, Windows, etc). Depending on the sites environment they will need to replace the default eclipse.product file with the one that meets their needs.

These files need to be organized in a manner that makes it easy for sites to find what they need.

Plugin: edu.harvard.i2b2.eclipse
New folder: platform-configurations

Within the platform-configuration folder will be the following folders that will contain all the files needed for that particular platform.

linux(32-bit)
linux(64-bit)
mac
windows(32-bit)
windows(64-bit)

By default, the i2b2eclipse.product file that resides on the top level of the edu.harvard.i2b2.eclipse plugin directory will be configured for windows(64-bit).

If a site uses 32-bit, all they need to do is replace the i2b2eclipse.product file on the top level with the one that resides in the windows(32-bit) folder. It is important to note that the user has to rename product file to be i2b2eclipse.product or else the workbench will not work.