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It was causing errors on pre-existent installations, that used the field
as if it contained the key.

Relaxed permissions check, as it was silently return if they were wrong
and this is very confusing for a user (that should open the log to see the
error)

- Mounter class take all work for managing sshfs process
- SftpPlugin became much more easy and cleaner

kded_kdeconnect KDEDModule is a very simple daemon manager now, which allow to start/stop/restart
real daemon.

kdeconnectd is almost unmodified implementation of Daemon class wrapped with main() and QCoreApplication.

 - privateKey now stored in ~/.kde4/apps/kdeconnect/key.pem
 - publicKey now stored in ~/.kde4/apps/kdeconnect/key.pub
 - Daemon checks right permission(very strict) when starting

Testing needed :)

When unpairing from device

Conflicts:
	libkdeconnect/dbusinterfaces.cpp

visibleDevices() is not needed anymore and has been removed

They are needed to instantiate them as non-pointer variables

- SftpDbusInterface merged to SftpPlugin object
- mountpoint cleaning technique to avoid fuse errors with dangling mountpoints