GHC 7.6.1 compatibility

- switch from ClockTime to UTCTime in Info.pprInfo
- make ghc-mod loggers always take a first argument of type DynFlags
- consolidate GHC API shims in Gap.hs--this depends on tracingDynFlags,
which is unfortunate

ghc-mod.cabal

@@ -45,6 +45,7 @@ Executable ghc-mod
   GHC-Options:          -Wall
   Build-Depends:        base >= 4.0 && < 5
                       , Cabal
+                      , convertible
                       , directory
                       , filepath
                       , ghc
@@ -53,10 +54,10 @@ Executable ghc-mod
                       , hlint >= 1.7.1
                       , io-choice
                       , old-time
-                      , time
                       , process
                       , regex-posix
                       , syb
+                      , time
                       , transformers
 
 Source-Repository head