Added fullCompress feature

The Cache can now compress all data in one single buffer, instead of one buffer for each key. This makes the compression more effective, but also takes a minor performance hit, as the entire buffer has to be decompressed, converted to an Object, then compressed again.

But this can be usefull for big websites.

Maintenance

Updated docs, and cleaned up some unused code.
Implemented checks for non http(s) links

Initial public release

This is the initial public release of InstantLink