add tag v-10_24_21_06_17_OQB_2

develop branch from v-10_19_21_06_17_OB: commit 6c33eb5
Author: Roberto Congiu <rcongiu@yahoo.com>
Date:   Tue May 16 17:04:46 2017 -0700

    fixed typo , mappings vs correct mapping in example in README, fixes rcongiu#190

to v-10_24_21_06_17_OB: commit 6c33eb5
Author: Roberto Congiu <rcongiu@yahoo.com>
Date:   Tue May 16 17:04:46 2017 -0700

    fixed typo , mappings vs correct mapping in example in README, fixes rcongiu#190

last tag-commit: 755de13