Added GetOrganizationByName. Update README.MD with usage

itglue/organizations.go

@@ -3,6 +3,7 @@ package itglue
 import (
 	"encoding/json"
 	"fmt"
+	"net/url"
 )
 
 //OrganizationInternalData contains the schema of an Organization in IT Glue without the "data" wrapper.
@@ -39,13 +40,22 @@ type OrganizationList struct {
 //Returns a pointer to an Organization struct
 func (itg *ITGAPI) GetOrganizationByID(organizationID int) *Organization {
 	itgurl := itg.BuildURL(fmt.Sprintf("/organizations/%d", organizationID))
-
 	body := itg.GetRequest(itgurl)
-
 	organization := &Organization{}
 	err := json.Unmarshal(body, organization)
 	check(err)
-
 	return organization
-
+}
+
+//GetOrganizationByName expects an exact matching organization name and returns an OrganizationList
+func (itg *ITGAPI) GetOrganizationByName(organizationName string) *OrganizationList {
+	itgurl := itg.BuildURL("/organizations")
+	params := url.Values{}
+	params.Add("filter[name]", organizationName)
+	itgurl.RawQuery = params.Encode()
+	body := itg.GetRequest(itgurl)
+	organization := &OrganizationList{}
+	err := json.Unmarshal(body, organization)
+	check(err)
+	return organization
 }