Re-organize internal files a bit

bin/tmuxifier

@@ -9,7 +9,7 @@ else
 fi
 
 # Load tmuxifier environment variables.
-source "$TMUXIFIER/env.sh"
+source "$TMUXIFIER/lib/env.sh"
 
 export PATH="$TMUXIFIER/libexec:$PATH"
 

lib/runtime.sh

@@ -3,7 +3,7 @@
 #
 
 # Load tmuxifier environment.
-source "$TMUXIFIER/env.sh"
+source "$TMUXIFIER/lib/env.sh"
 
 # Setup default variables.
 session_root="$HOME"

libexec/tmuxifier-load-session

@@ -16,7 +16,7 @@ if [ -z "$1" ]; then
 fi
 
 # Load runtime functions.
-source "$TMUXIFIER/runtime.sh"
+source "$TMUXIFIER/lib/runtime.sh"
 
 # Load session file.
 load_session "$1"

libexec/tmuxifier-load-window

@@ -16,7 +16,7 @@ if [ -z "$1" ]; then
 fi
 
 # Load runtime functions.
-source "$TMUXIFIER/runtime.sh"
+source "$TMUXIFIER/lib/runtime.sh"
 
 if [ ! -z $TMUX ]; then
   session="$(tmuxifier-current-session)"