remove outdated haskell-mode recipe
recipe for restclient
consolidate 3 zenburn recipes into 1

zenburn-emacs.rcp referred to the same code as
color-theme-zenburn.rcp. zenburn-theme.rcp referred to a version of
zenburn that hasn't been updated for 2 years.
fixed features statements for some recipes
fixed recipe name for php-electric
remove recipe for silentcomp as it provides obsolete functionality
Merge some recipe fixes

* pr1698: (5 commits) : some fixes + restclient recipe
* 1zen: consolidate 3 zenburn recipes into 1