Relax various library dependencies to support GHC-7.4.0

No code changes were necessary to be able to compile it with GHC-7.4.0 as it
already compiles with GHC-7.2.x thanks to Mitsutoshi Aoe's work on that.

scion.cabal

@@ -38,18 +38,18 @@ flag server
 library
   default-language: Haskell2010
   build-depends:
-    base         >= 4.2 && < 4.5,
-    Cabal        >= 1.8 && < 1.13,
+    base         >= 4.2 && < 4.6,
+    Cabal        >= 1.8 && < 1.15,
     containers   >= 0.3 && < 0.5,
     directory    >= 1.0 && < 1.2,
-    filepath     >= 1.1 && < 1.3,
-    ghc          >= 6.12 && < 7.3,
+    filepath     >= 1.1 && < 1.4,
+    ghc          >= 6.12 && < 7.5,
     ghc-paths    == 0.1.*,
     multiset     >= 0.1 && < 0.3,
-    time         >= 1.1 && < 1.3,
+    time         >= 1.1 && < 1.5,
     text         >= 0.11 && < 0.12,
     process      >= 1.0 && < 1.2,
-    unix-compat  >= 0.2 && < 0.3,
+    unix-compat  >= 0.2 && < 0.4,
     bytestring   >= 0.9 && < 0.10,
     binary       >= 0.5 && < 0.6,
     old-locale   >= 1.0 && < 1.1,
@@ -94,7 +94,7 @@ executable scion-worker
   default-language: Haskell2010
   build-depends:
     scion,
-    base         >= 4.2 && < 4.5
+    base         >= 4.2 && < 4.6
 
 executable scion-server
   if !flag(server)
@@ -105,8 +105,8 @@ executable scion-server
   build-depends:
     scion,
     atto-lisp    >= 0.2     && < 0.3,
-    attoparsec   >= 0.8.5.1 && < 0.10,
-    base         >= 4.2     && < 4.5,
+    attoparsec   >= 0.8.5.1 && < 0.11,
+    base         >= 4.2     && < 4.6,
     bytestring   >= 0.9     && < 0.10,
     multiset     >= 0.1     && < 0.3,
     network      >= 2.3     && < 2.4,