refactor method name and added go1.7

Author: jeevatkm

.gitignore

@@ -7,6 +7,9 @@
 _obj
 _test
 
+# test
+coverage.out
+
 # Architecture specific extensions/prefixes
 *.[568vq]
 [568vq].out

.travis.yml

@@ -8,8 +8,8 @@ branches:
     - develop
 
 go:
-  - 1.5
   - 1.6
+  - 1.7
   - tip
 
 before_install:

formatter.go

@@ -32,7 +32,7 @@ type FlagPart struct {
 //  For e.g.:
 //    %time:2006-01-02 15:04:05.000 %level %custom:- %msg
 func parseFlag(format string) (*[]FlagPart, error) {
-	if ess.StrIsEmpty(format) {
+	if ess.IsStrEmpty(format) {
 		return nil, ErrFormatStringEmpty
 	}
 

log.go

@@ -188,7 +188,7 @@ type Logger interface {
 
 // New creates the logger based config supplied
 func New(configStr string) (Logger, error) {
-	if ess.StrIsEmpty(configStr) {
+	if ess.IsStrEmpty(configStr) {
 		return nil, errors.New("logger config is empty")
 	}