move icon files to a subfolder
add icon design with retina support
.gitignore
Improve HTML of Credits and Readme

* add meta tag with encoding (current OS X may garble the UTF-8 otherwise)
* use html5 doctype
Fix HTML error in French Credits
update .gitignore
stop using deprecated NSFileManager methods
switch from deprecated -runningApplications to -launchedApplications
fix capitalisation of 'from' Header name

(as used by current versions of Mail)
Remove old iLocalise files
use NSImage for image bindings

(instead of going through NSData as was required in older OS X versions)
deal with different paths used by Mail before / after X.7
remove code for plist path on pre X.7 systems
fix incorrect mailIsRunning condition
improve Plist replacement code

* do not change array while iterating it
* better variable names
Update dates
add cleanupSparkle.sh

script to clean a fully built Sparkle framework
assign [super init] to self
use Sparkle instead of VersionChecker to check for udpates
update localisation / new iLocalise project