Close #17 and Close #16

Introduces CMDARG_ERROR_BEHAVIOR. Adds some more tests. Introduces new
behavior for hash validators (see README). Fixes a few odds and ends.

tests/test_validators.sh

@@ -0,0 +1,54 @@
+#!/usr/bin/bash4
+
+source $(dirname ${BASH_SOURCE[0]})/../cmdarg.sh
+
+function shunittest_validator_for_hash
+{
+    function my_hash_validator
+    {
+	value=${1:-$OPTARG}
+	echo "my_hash_validator $value" >&2
+	[[ "$value" == "value" ]]
+    }
+    
+    declare -A something
+    
+    cmdarg_purge
+    cmdarg 'x:{}' 'something' 'something' '' my_hash_validator || return 1
+    set -x
+    cmdarg_parse --something key=notavalue && return 1
+    return 0
+}
+
+function shunittest_validator_for_array
+{
+    function my_array_validator
+    {
+	value=${1:-$OPTARG}
+	echo "my_array_validator $value" >&2
+	[[ "$value" == "value" ]]
+    }
+    
+    declare -a something
+    
+    cmdarg_purge
+    cmdarg 'x:[]' 'something' 'something' '' my_array_validator || return 1
+    cmdarg_parse --something notavalue && return 1
+    return 0
+}
+
+function shunittest_validator_failure_recognized
+{
+
+    function my_validator
+    {
+	value=${1:-$OPTARG}
+	echo "my_validator $value" >&2
+	[[ "$value" == "value" ]]
+    }
+    
+    cmdarg_purge
+    cmdarg 'x:' 'something' 'something' '' my_validator
+    cmdarg_parse --something notavalue || return 0
+    return 1
+}