Adding an option to serve archived (gzipped) resources

[alikg]

if we set enable.archived.resources=true in the properties file we will be able to
store ONLY the .gz version of the resource and return it to requesting client if the original version is not found.

Consider a request for a resource test.js
The flow will be the following
if test.js exists
if test.js.gz exists and supported by browser return test.js.gz
else retrurn test.js
else if test.js.gz exists and return if so (but still report the original resource's name)

else return null (as we would anyway).

[alikg]

Added a ZipOnTheFly mechanism which will compress all non-excluded extensions before uploading them to the remote server;
There are two new settings in remoteDifido.properties
#the value is in bytes!
compress.files.above=5000
#the following the extensions that are NOT compressed by default
dont.compress.extensions=7z;zip;rar;gzip;gz;jpg;jpeg;png;gif;avi;xvid;mp4;mp3;tif;tiff;pdf;wmf;svg;exe;jar