Adjustments to improve styling when used with IMCE version 2.x and addition of known compatible versions of IMCE to README

Issue #1064886 based on patch by ducktape - adjusted integration with IMCE to work with both version 1.0 and 2.0 and to provide an error message when an incompatability with the installed IMCE version is detected

Addition of README file and error messages when SWFUpload module does not appear to be installed correctly

Import of version 2 of imce_swfupload module. Allows for bulk upload capabilities provided by the SWFUpload module to be available to the IMCE module