moved source code to src

This is to work around OSX's brain-damange regarding filename case
insensitivity.

Avoided moving config.hs, because it's a config file. Put in a symlink to
make build work.

propellor.cabal

@@ -33,9 +33,10 @@ Description:
  .
  It is configured using haskell.
 
-Executable propellor
+Executable wrapper
   Main-Is: wrapper.hs
   GHC-Options: -Wall -threaded
+  Hs-Source-Dirs:  src
   Build-Depends: MissingH, directory, filepath, base >= 4.5, base < 5, 
    IfElse, process, bytestring, hslogger, unix-compat, ansi-terminal,
    containers, network, async, time, QuickCheck, mtl,
@@ -47,6 +48,7 @@ Executable propellor
 Executable config
   Main-Is: config.hs
   GHC-Options: -Wall -threaded
+  Hs-Source-Dirs:  src
   Build-Depends: MissingH, directory, filepath, base >= 4.5, base < 5, 
    IfElse, process, bytestring, hslogger, unix-compat, ansi-terminal,
    containers, network, async, time, QuickCheck, mtl,
@@ -57,6 +59,7 @@ Executable config
 
 Library
   GHC-Options: -Wall
+  Hs-Source-Dirs:  src
   Build-Depends: MissingH, directory, filepath, base >= 4.5, base < 5, 
    IfElse, process, bytestring, hslogger, unix-compat, ansi-terminal,
    containers, network, async, time, QuickCheck, mtl,

src/config.hs

@@ -0,0 +1 @@
+../config.hs