rework code to allow handling of comma (,) and = within the params i.e. excludesall=,=

add test cases for comma and = validation within params
add documentation stating how to include a comma within the parameters

for #67

doc.go

@@ -143,6 +143,11 @@ NOTE: Baked In Cross field validation only compares fields on the same struct,
 if cross field + cross struct validation is needed your own custom validator
 should be implemented.
 
+NOTE2: comma is the default separator of validation tags, if you wish to have a comma
+included within the parameter i.e. excludesall=, you will need to use the UTF-8 hex
+representation 0x2C, which is replaced in the code as a comma, so the above will
+become excludesall=0x2C
+
 Here is a list of the current built in validators:
 
 	-

validator.go

@@ -20,6 +20,7 @@ import (
 )
 
 const (
+	utf8HexComma    = "0x2C"
 	tagSeparator    = ","
 	orSeparator     = "|"
 	noValidationTag = "-"
@@ -428,7 +429,7 @@ func (v *Validate) fieldWithNameAndValue(val interface{}, current interface{}, f
 				cField.tags = append(cField.tags, cTag)
 
 				for i, val := range orVals {
-					vals := strings.Split(val, tagKeySeparator)
+					vals := strings.SplitN(val, tagKeySeparator, 2)
 
 					key := strings.TrimSpace(vals[0])
 
@@ -438,7 +439,7 @@ func (v *Validate) fieldWithNameAndValue(val interface{}, current interface{}, f
 
 					param := ""
 					if len(vals) > 1 {
-						param = vals[1]
+						param = strings.Replace(vals[1], utf8HexComma, ",", -1)
 					}
 
 					cTag.keyVals[i] = []string{key, param}

validator_test.go

@@ -281,6 +281,16 @@ func TestExcludesAllValidation(t *testing.T) {
 
 	err := validate.Field(username, "excludesall=@ ")
 	NotEqual(t, err, nil)
+
+	excluded := ","
+
+	err = validate.Field(excluded, "excludesall=!@#$%^&*()_+.0x2C?")
+	NotEqual(t, err, nil)
+
+	excluded = "="
+
+	err = validate.Field(excluded, "excludesall=!@#$%^&*()_+.0x2C=?")
+	NotEqual(t, err, nil)
 }
 
 func TestExcludesValidation(t *testing.T) {