Bind C-x C-e to pp-eval-last-sexp in emacs lisp mode
Record time taken for each require
Use package-installed-p to detect dash-at-point
Add slime contrib dir to load-path at top level

This ensures that when a version of slime is installed which includes
the contrib subdir, then libraries in that dir are placed on the
load-path ahead of any dangling 2010* versions of slime-repl,
slime-fuzzy etc.

See #90
Merge branch 'master' of git://github.com/purcell/emacs.d
global enable yasnippet