Merge branch 'hotfix/fix_map' into develop

* hotfix/fix_map:
  fix map
  update rails and tconsole
  Update README.md
  Update README.md
  Update README.md
downgrade version of prawn because of this issue
https://github.com/prawnpdf/prawn/issues/734
fix test
Merge branch 'release/1.6.1'

* release/1.6.1:
  fix test
  downgrade version of prawn because of this issue https://github.com/prawnpdf/prawn/issues/734