Updates, upgrades and changes

Issue Summary

This is going to be quite a significant change but please review the changes in the following patch and update the module if possible. The changes include the following:

- Updates to bring the module more in line with the drupal.org coding standards
- Changing function names to reduce the possibility of naming conflicts with other modules
- Changing variable names from the settings page to reduce the possibility of naming conflicts with other modules
- hook_update_N function in uc_eway.install to help migration from old variable format to new variable format
- Added a 'Powered by eWAY' block to the list of available blocks and put some options under the block config to allow the user to choose the colour and size of the image. These options have been taken from this page: http://www.eway.com.au/Developer/Downloads/eWAYSiteSeal.aspx
- Added all four images from the above page to the module under uc_eway/images to facilitate the choice outlined above
- Added the Beagle Anti-Fraud eWAY method to the list of available eWAY modes
- removed the ewayLarge.jpg from the module

I didn't update the README.txt, but that does seem out of date. I've attached the patch file for the changes to the .module and .ca.inc. I've also attached the images that need to be put in uc_eway/images (or where ever if you update the function uc_eway_logo_path()). You'll also need to remove ewayLarge.jpg manually.

Please let me know what you think of this patch.

Thanks!