Stop add lines / create new files when install rvm!

[tmpm697]

Description

Steps to reproduce

1. install new rvm instance
2. or update rvm

e.g:

Upgrading the RVM installation in /home/user/.rvm/
    Adding rvm PATH line to /home/user/.profile /home/user/.mkshrc /home/user/.bashrc /home/user/.zshrc.
    Adding rvm loading line to /home/user/.profile /home/user/.bash_profile /home/user/.zlogin.

Expected behavior

rvm output suggestions to add lines to files instead of forcing add lines to files or create new ones if not exist

Actual behavior

for the sake of god, this plugin forcing add lines to exist files and create new files if they not exist.