Revert "Add ruby version supecification to Gemfile"

This reverts commit b31de42b38b101632b62ea13b62be3333859c836.
Revert "Add ruby version supecification to Gemfile"

This reverts commit b31de42b38b101632b62ea13b62be3333859c836.

# Please enter the commit message for your changes. Lines starting
# with '#' will be ignored, and an empty message aborts the commit.
# On branch master
# Changes to be committed:
#   (use "git reset HEAD <file>..." to unstage)
#
#	modified:   Gemfile
#
# Changes not staged for commit:
#   (use "git add <file>..." to update what will be committed)
#   (use "git checkout -- <file>..." to discard changes in working directory)
#
#	modified:   app/helpers/application_helper.rb
#
revert