Some cleanup needed (fix warnings)

[stchris]

Here's the output of make on Ubuntu 12.04:

In file included from /home/chris/dev/spotifyd/src/spotifyd_srv.cpp:26:0:
/home/chris/dev/spotifyd/include/spotify_cust.h:175:33: sorry, unimplemented: non-static data member initializers
/home/chris/dev/spotifyd/src/spotifyd_srv.cpp: In constructor ‘XplodifyHandler::XplodifyHandler()’:
/home/chris/dev/spotifyd/src/spotifyd_srv.cpp:48:1: error: uninitialized member ‘XplodifyHandler::LOGIN_TO’ with ‘const’ type ‘const size_t {aka const long unsigned int}’ [-fpermissive]
/home/chris/dev/spotifyd/src/spotifyd_srv.cpp: In member function ‘virtual void XplodifyHandler::loginSession(SpotifyCredential&, const SpotifyCredential&)’:
/home/chris/dev/spotifyd/src/spotifyd_srv.cpp:128:14: warning: unused variable ‘err’ [-Wunused-variable]
/home/chris/dev/spotifyd/src/spotifyd_srv.cpp: At global scope:
/home/chris/dev/spotifyd/src/spotifyd_srv.cpp:307:6: warning: unused parameter ‘_return’ [-Wunused-parameter]
/home/chris/dev/spotifyd/src/spotifyd_srv.cpp:307:6: warning: unused parameter ‘criteria’ [-Wunused-parameter]
/home/chris/dev/spotifyd/src/spotifyd_srv.cpp:477:6: warning: unused parameter ‘pl’ [-Wunused-parameter]
/home/chris/dev/spotifyd/src/spotifyd_srv.cpp:477:6: warning: unused parameter ‘tracks’ [-Wunused-parameter]
/home/chris/dev/spotifyd/src/spotifyd_srv.cpp:488:6: warning: unused parameter ‘pl’ [-Wunused-parameter]
/home/chris/dev/spotifyd/src/spotifyd_srv.cpp:488:6: warning: unused parameter ‘track’ [-Wunused-parameter]
/home/chris/dev/spotifyd/src/spotifyd_srv.cpp:499:6: warning: unused parameter ‘_return’ [-Wunused-parameter]
/home/chris/dev/spotifyd/src/spotifyd_srv.cpp:615:5: warning: unused parameter ‘argc’ [-Wunused-parameter]
/home/chris/dev/spotifyd/src/spotifyd_srv.cpp:615:5: warning: unused parameter ‘argv’ [-Wunused-parameter]

[truthbk]

Plenty of this... eventually, still unsure if I'll need some of them.