Add upper bound on 'statistics'; broaden .gitignore

.gitignore: products of manual cabal builds, and vim temp files
hledger.cabal: *.RootFinding removed from statistics >=0.15 in favor
  of that in math-functions >=0.2

.gitignore

@@ -36,6 +36,7 @@ TAGS
 /[0-9]*
 #
 *.j
+*.sw[op]
 
 # haskell stuff
 *.dyn_hi
@@ -43,11 +44,13 @@ TAGS
 *.hi
 *.p_o
 *.hp
+.cabal-sandbox/
 cabal-dev*
 cabal.project.local
 cabal.sandbox.config
 dist/
 dist-newstyle/
+.ghc.environment.*
 /Shake
 /.shake.html
 .stack-work/

hledger/hledger.cabal

@@ -143,7 +143,7 @@ library
     , safe >=0.2
     , shakespeare >=2.0.2.2
     , split >=0.1
-    , statistics
+    , statistics <0.15
     , tabular >=0.2
     , temporary
     , text >=0.11
@@ -194,7 +194,7 @@ executable hledger
     , safe >=0.2
     , shakespeare >=2.0.2.2
     , split >=0.1
-    , statistics
+    , statistics <0.15
     , tabular >=0.2
     , temporary
     , text >=0.11
@@ -248,7 +248,7 @@ test-suite test
     , safe >=0.2
     , shakespeare >=2.0.2.2
     , split >=0.1
-    , statistics
+    , statistics <0.15
     , tabular >=0.2
     , temporary
     , test-framework
@@ -303,7 +303,7 @@ benchmark bench
     , safe >=0.2
     , shakespeare >=2.0.2.2
     , split >=0.1
-    , statistics
+    , statistics <0.15
     , tabular >=0.2
     , temporary
     , text >=0.11

hledger/package.yaml

@@ -104,7 +104,7 @@ dependencies:
 - safe >=0.2
 - shakespeare >=2.0.2.2
 - split >=0.1
-- statistics
+- statistics <=0.15
 - tabular >=0.2
 - temporary
 - text >=0.11